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posix sh, be it dash or ash, can do 90% of whatever bash does and is way more portable.

I'm not sure I understand this. Those shells only have 90% of bash functionality, but are somehow more portable?

I get the POSIX argument, but I'm not sure I agree. In my experience at least, POSIX is less supported than bash.

I'm pretty confident that any random terminal I have to ssh into will have a bash shell. I ssh into a lot of terminals.

I know where you're coming from, it just doesn't chime with my personal experience.

on embedded boards which are deployed 100x more than desktops and are typically resource restricted you have to use posix shell instead of the mega-bytes bash there.

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