Staying sane is not self sustainable. It is not a coincidence that most people will go mad if you isolate them for a prolonged time.
It is also not only about seeing insane. You can be crazy and still seem completely sane. Staying sane requires course corrections from the people around you. People are not self-sustaining beings. If you do not get pushback and feedback constantly, you will go off the rails.
What LLMs are bringing is an illusion of feedback, but in the end you are just isolating yourself and becoming insane. LLMs are a nice tool, but they will not replace people around you.