Stylesheets pose none of these problems. In fact, if stylesheets were invented today, I strongly suspect we’d be vaunting the technology for its independent and portable nature. But stylesheets are not new, and so there’s no interest in stylesheets from neophiles.
As an inclusive design consultant, one of the most glaring issues with making people the gatekeepers of all-things-code is the pitiful quality of the HTML output. Most Full Stack Developers come from a computer science background, and document structure is simply not taught alongside control structure. It’s not their competency, but we still make it their job.