It's a bias to think the problem is people not knowing how to architect a good CSS solution. The reality is projects are maintained by multiple people over the course of its life. OOCSS only brings technical debt and constraints, and not to mention bloated CSS files. A good explanation why OCSS is bad https://www.fcss.club/manifesto and why functional CSS or atomic css is better in the short and long-term https://www.fcss.club/why. Tailwind just brings more complexity.