If you hired an intern or spent 10 nights yourself you could also have added a FLAC player to your imaginary app. Making bad product decisions is not inherent to the use of LLMs, and whether adding a useless feature is a waste of development effort has always been subject to discussion.
Extra features don’t necessarily make your app slower and heavier on RAM, that issue has been solved by the concept of dynamic loading - 40 years ago.
It would be the genetic fallacy to reject all AI generated plugins purely because they were written by AI. Being AI generated may have previously been a decent heuristic for being slop but with models improving it can become increasingly difficult to tell the difference between human and AI output. If the concern is quality/security then I think that it would be safer to assume all code is unsafe until it is reviewed by some kind of crowdsourced peer review system.