The OS is the distilled wisdom of other experts. Wisdom that neither I, nor the current generation of next-word-guessers, could possibly keep pace with; no matter how many reddit bots the frontier lab operates in its attempt to extract complex concepts into simpler vectors. It will be the collection of things that are so unbelievably expensive to reinvent and re-learn for each machine and user, that they are not subject to to the market forces that come with making the slop cheaper. Any well-maintained OS will maintain that role. And be ever more important in the future, as apps diverge into even lower quality and even less shared benefit from improving them (for the other approx. 2 users).