All of the examples are within the last 2 years. My area of specialization is enterprise content management; I build the CMS AND the front-end for very large companies that use decoupled CMSs and web sites. And very often, the web app is a typical server-side .net app where a front-end team has written static HTML and handed it off to back-end developers to be sliced into views. So all of this stuff kinda comes from over a decade of doing THAT; it's fair to say that maybe this doesn't all apply if you're an app dev.
But even when I DO build SPAs (like I am for one client), I still use CSS in traditional stylesheets as much as possible because any inline styling that doesn't invoke the CSSOM directly like it should seems like a massive waste of DOM resources ... and also I feel like I lose out on reusability that way.
That "clean code for typescript" is really good. I may drop a link to it in mine. I wasn't trying to be exhaustive. I was just trying to set a good baseline for where to go ;)