I use raw CSS. I just scope it to the component level and I've never had a problem on any of the projects I've worked on. I do tend to avoid absolutely massive

I use raw CSS. I just scope it to the component level and I've never had a problem on any of the projects I've worked on. I do tend to avoid absolutely massive projects but I've worked on plenty of fairly big codebases and there is no problem as long as the CSS is scoped well using CSS modules. Inline styles are awful for maintainability and readability of the html, which is an important semantic description of your content.