If we could have solved the really big problems that remain with SaaS apps, we probably would have already. We're really good at building them. Most of the really big problems the world is facing require really hard solutions. Often this involves commercializing core research (like the foundation model companies) or building in atoms and not just bits. The sheer amount of talent and money going into SaaS feels like a massive misallocation of resources.
What we're not good at is overcoming humans. We could have a much better present that needs less fixing if people simply behaved differently, economically, socially, politically. It would be great if these breathless screeds could encourage figuring out how to have tech benefit humanity.