Code generated from LLMs is going to need more testing than code written by developers. This seems self-evident to me, but I suspect a lot of people are going to learn it (or ignore it) the hard way.

Given that most existing codebases are not well tested, and most developers don't test, this does not bode well.

The practical consequence of using LLMs to generate code is that many developers will find they have unwittingly moved themselves into a role they were probably trying to avoid: they have automated the creation of legacy code and have redefined their job role as debugging and fixing such code.
@kevlin me, rewriting co-pilots class casts to instanceof pattern matching in java 10 times a day: too real