How about this.  Comments interleaved:

  @@ -23,7 +23,9 @@ the usefulness of the raw Debian source package.  The 
Debian archive
   is thought of as an output format.

   For example, we don't spend time curating a series of quilt patches.
  -However, the information such a series would contain is readily
  +However,
  +in straightforward cases,
  +the information such a series would contain is readily
   available from B<dgit-repos>.

This sentence wasn't quite true (as Daniel points out) without
qualification.

   =item
  @@ -34,6 +36,17 @@ that upstream makes available for download.

   =back

  +This workflow is less suitable for some packages.
  +When the Debian delta contains multiple pieces which interact,
  +or which you aren't going to be able to upstream soon,
  +it might be preferable to
  +maintain the delta as a rebasing patch series,

This part is from the most recent suggestion, from Daniel.
I suggest adding this part...

  +to facilitate
  +reviewing/upstreaming/dropping
  +individual pieces.

... because I agreed with Daniel's point about rationales.

  +For such a workflow see for example
  +dgit-maint-gbp(7).

And I think a cross-reference is helpful here so the advice isn't a
dead-end.

  -The Debian packaging of foo is maintained using dgit.  For the sake of
  -an efficient workflow, Debian modifications to the upstream source are
  -squashed into a single diff, rather than a series of quilt patches.
  -To obtain a patch queue for package version 1.2.3-1:
  +The Debian packaging of foo is maintained in git,
  +using the merging workflow described in dgit-maint-merge(7).
  +An automatically generated representation of the Debian changes follows.

This is from Sean's lates suggestion, except that

  +A detailed break down of these changes is available from their
  +canonical representation -
  +git commits in the packaging repository.

I have changed the punctation, and written `git commits' rather than
just `commits'.  I think this is clearer.

  +For example, to see the changes made by the Debian maintainer in the
  +first upload of upstream version 1.2.3, you could use:

   =over 4

  -    # apt-get install dgit
  -    % dgit clone foo
  +    % git clone https://git.dgit.debian.org/
       % cd foo
       % git log --oneline 1.2.3..debian/1.2.3-1 -- . ':!debian'

   =back

  -See dgit(1), dgit(7) and dgit-maint-merge(7) for more information.
  +See dgit-maint-merge(7) for more information.

If we are advising people to use git clone, they don't need to read
the dgit docs.  But:

  +(If you have dgit, use dgit clone foo,
  +rather than plain git clone.)

Sean writes:
> I don't think the `dgit clone` need be given since the `git clone` will
> contain git.dgit.debian.org, so anyone even slightly familiar with dgit
> will know they can use `dgit clone` if they want to.

I don't think they will necessarily know that it's advisable.  There
are a two reasons I can think of why `dgit clone' is better:

 * It will include changes made in non-dgit-based uploads (eg NMUs).
   I hope that non-dgit users who read about `the packaging
   repository' will realise that it may not contain out-of-workflow
   uploads such as (some) NMUs.  But dgit users might assume that it
   does.  I hope that an imprecation to use dgit where available,
   without a rationale, will suffice.

 * dgit sets up trees somewhat differently; a dgit user will probably
   want the effects of `dgit setup-*' which are implied by `dgit
   clone'.

Opinions ?

(I have included the complete diff as an attachment.)

Ian.

diff --git a/dgit-maint-merge.7.pod b/dgit-maint-merge.7.pod
index 5b425b55..47ac4a07 100644
--- a/dgit-maint-merge.7.pod
+++ b/dgit-maint-merge.7.pod
@@ -23,7 +23,9 @@ the usefulness of the raw Debian source package.  The Debian 
archive
 is thought of as an output format.
 
 For example, we don't spend time curating a series of quilt patches.
-However, the information such a series would contain is readily
+However,
+in straightforward cases,
+the information such a series would contain is readily
 available from B<dgit-repos>.
 
 =item
@@ -34,6 +36,17 @@ that upstream makes available for download.
 
 =back
 
+This workflow is less suitable for some packages.
+When the Debian delta contains multiple pieces which interact,
+or which you aren't going to be able to upstream soon,
+it might be preferable to
+maintain the delta as a rebasing patch series,
+to facilitate
+reviewing/upstreaming/dropping
+individual pieces.
+For such a workflow see for example
+dgit-maint-gbp(7).
+
 =head1 INITIAL DEBIANISATION
 
 This section explains how to start using this workflow with a new
@@ -230,21 +243,27 @@ changes to the upstream source:
 
 =over 4
 
-The Debian packaging of foo is maintained using dgit.  For the sake of
-an efficient workflow, Debian modifications to the upstream source are
-squashed into a single diff, rather than a series of quilt patches.
-To obtain a patch queue for package version 1.2.3-1:
+The Debian packaging of foo is maintained in git,
+using the merging workflow described in dgit-maint-merge(7).
+An automatically generated representation of the Debian changes follows.
+
+A detailed break down of these changes is available from their
+canonical representation -
+git commits in the packaging repository.
+For example, to see the changes made by the Debian maintainer in the
+first upload of upstream version 1.2.3, you could use:
 
 =over 4
 
-    # apt-get install dgit
-    % dgit clone foo
+    % git clone https://git.dgit.debian.org/
     % cd foo
     % git log --oneline 1.2.3..debian/1.2.3-1 -- . ':!debian'
 
 =back
 
-See dgit(1), dgit(7) and dgit-maint-merge(7) for more information.
+See dgit-maint-merge(7) for more information.
+(If you have dgit, use dgit clone foo,
+rather than plain git clone.)
 
 =back
 

-- 
Ian Jackson <ijack...@chiark.greenend.org.uk>   These opinions are my own.

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