>There are lots of behavior differences when bash's POSIX mode is set.
AFAIU correct POSIX scripts will behave correctly with Bash POSIX mode. Incorrect POSIX scripts will not behave incorrectly with Bash POSIX mode as one might expect with a more faithful shell implementation.
IMO Bash POSIX mode is not a problem for running scripts, although you should test your scripts using a strictly shell implementation if you will then distribute those scripts to other users/platforms.
AFAIU correct POSIX scripts will behave correctly with Bash POSIX mode. Incorrect POSIX scripts will not behave incorrectly with Bash POSIX mode as one might expect with a more faithful shell implementation.
IMO Bash POSIX mode is not a problem for running scripts, although you should test your scripts using a strictly shell implementation if you will then distribute those scripts to other users/platforms.