I would simply say if you're planning on making changes to the script you probably shouldn't write it in bash. Or to be a little more rigorous, don't use bash if you couldn't rewrite the entire script, correctly, from scratch, in an hour.

Although I think all of these things are just complicated ways of saying "please seriously reconsider writing it in bash."

But I write bash scripts all the time, I just try to keep them as short and simple as possible.