For example, angular, react, vue, etc. You can follow these tools as their popularity comes and go, but at the end of the day they exist on top of HTML/CSS/JS. So while these 3 basic blocks are there to stay forever, the tools on top are a game of musical chairs.

I'm not saying that they are bad. I've been using them at works for years. I'm saying that some people chose to focus on "old" tech and produce web pages and webapps without much tools. The advantage of this approach is that your environment is stable so you can actually learn and master the tools. You can even find crazy tricks and "abuse" some of the features as you become really good at those.

It can be liberating to stop changing tools every year, but instead learn the intricacies of the basic tools that will never change.