I've learned that people use what they familiar with.

At first, I learned and use plain HTML/CSS/PHP and I thought that was good. At college, they taught .NET framework and for some years, that was my go to techstack. Then I started to learn about more languages and frameworks. At some point, it's hard to switch between them

Now I stick with one thing, unless that platform doesn't support it. This also allow me to be a lot more productive since I know most of the thing needed to be done

Sure I can start with vanilla web, or some new framework but it'll take a lot more of time and just not worth it