I'm a newbie but I don't know why I need to use lmtp at all. I was told by the comment in main.cf and master.cf that I can use
mailbox_transport = cyrus
and deliver(8) will be called to do mail delivery. Since I'm runing a single server, is there any obvious reason I should use lmtp at all?
The reference to the 'cyrus' mailbox_transport is outdated. You should now use lmtp instead. Anyway, deliver(8) use LMTP to actually deliver the mail, so you may cut the command invocation and have Postfix deliver via LMTP in the first place.
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