The overwhelming majority of Ubuntu users would almost never notice
application installs running faster?  I am serious.  There are packages
that take over a minute for post-install dpkg configuration, and dash
speeds them up a LOT.  It's the difference in spending 10 minutes or 30
minutes on dist-upgrade (or I guess adept probably just does upgrade).

Bash being optionally POSIX compliant, with or without exceptions,
really has no bearing here.  Bashisms are bad.  They need to be fixed.
I understand the idea of keeping Ubuntu easy for everyone to use, but
you also need to understand that sometimes you have to do things the
hard way to make the world a better place.  Ubuntu is the first major
distro to move to dash.  I think we have begun down a slippery slope
towards eradication of bashisms.  They never would have gone away if it
was just 'the right thing to do', but now if you write broken scripts
you give up support for a major distro.  I don't think any new bashisms
will be entering the world as soon as a year from now, and I expect we
can resolve any existing problems by then as well.  Bite the bullet.

-- 
Script that are using bash could be broken with the new symlink
https://launchpad.net/bugs/61463

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