For me it's the exact extreme opposite than your first point: The LLMs as death of copyright could be an actual food thing.
The issue im struggling with is the ecological and economic harm. It feels a bit as if the steam machine would've been invented but you'd throw in babies in addition to coal.
For the plus sides you're right (as in: I agree so it must be ;) )b- with one minor exception: the vibe coding part is not bad in itself. I actually used vibe coding as a very hard exercise: develop something and find ways to estimate its quality and performance but you are not allowed to look into the code! It's a fun brain teaser because it forces a pure outcome-perspective. The code itself is irrelevant for this, it's the mental training that's really interesting.
Oh except people who publish vibe coded stuff as a cool new project without disclaimer. Or as PRs. Or as ... Well anything where do see itself is actually important.