Agents can't write bash correctly so... I wonder about your claim

They cannot? We have a client from 25 years ago and all the devops for them are massive bash scripts; 1000s of them. Not written by us (well some parts as maintenance) and really the only 'thing' that almost always flawlessly fixes and updates them is claude code. Even with insane bash in bash in bash escaping and all kinds of not well known constructs. It works. So we habe no incentive to refactor or rewrite. We did 5 years ago and postponed as we first had to rewrite their enormous and equally badly written ERP for their factory. Maybe that would not have happened either now...