A lot of the web is powered by JS, but much less of it needs to be. Here’s a couple of sites that are part of a trend to not unnecessarily introduce it:
The negative implications for Google requiring JS is that they will use it to track everything possible about you that they can, even down to how you move your cursor, or how much battery you have left on your phone in order to jack up prices, or any other number of shitty things.
They’re also working with browser developers to push htmx into web standards, so that hopefully soon you won’t even need htmx/JS/etc, it’ll just be what your browser does by default