I hope I never have to be the one to read those scripts.

There’s a world of difference between having GPT4 write your scripts, and writing scripts with GPT4.

Why? They're generally much clearer and well-commented than what a rushed harried sysadmin would write.

But the lines and code snippets presumably won’t match the style of the rest of the program (or each other), so I guess that you’ll get programs which does things wildly differently from line to line.

Sounds like you've never actually used it for writing code, and are basing this on how you think it works. As someone who uses it for hours a day every day for writing code ... no, it does not have that problem.