The Linux kernel is literally Linus' project. If you don't like it, fork it and make your own. Many have.
I'm not exactly a big supporter of AI coding tools, but as someone who works with his hands quite a lot, I can appreciate those who understands and uses these things for what they are - tools. A tool used by the right person can absolutely help a lot. But becoming dependent on a tool to build more advanced stuff, while not understanding what the code does, is where the issues start.
I mean, sure, you can use it as a stepping stone to learn the more advanced stuff, but let's be honest, who is actually doing that? It's certainly not gonna be those "drive by" developers, I'll tell you that much. But do you know who does? People like Linus. Smart people who are bored by the minutia such as PRs and other automations that would have been scripted anyway.