I agree with you about discipline; but... was it not interesting to discover how to build such a discipline? Was it not intriguing to learn how people who had been writing CSS for years had made it tolerable?
Besides, there recently have been several crucial improvements to CSS to address these pain points. One is CSS layers, which lets define custom layers of specificity that help with the discipline (e.g. resets or some baseline styles go in a low layer, component styles go in a higher layer, and finally overrides end up in the highest layer). The other is CSS scope, which prevents the leakage of the styles. These should greatly help with the specificity issues; and @layer is now sufficiently broadly supported that it is safe to use.
> If you’re writing markup for a component, you have to jump between two files.
Yeah; one of the reasons for my question about the groups in which tailwind saw the biggest growth was that in some ecosystems jumping between files was not a problem to begin with. Vue, for instance, had single-file components, where css could be written in the same file as javascript. So did svelte. So does astro.