I think you're missing the part where they quote the recommendation from the HTML spec:

> For this reason, it's generally better to avoid using noscript, and to instead design the script to change the page from being a scriptless page to a scripted page on the fly

That seems perfectly reasonable for modern sites and browsers to be able to do. `noscript` is effectively a relic from older days where you just didn't have the same budgets, tools, and browsers as today, where you couldn't seamlessly enhance the site how you can now. We shouldn't continue to use it in the same way we shouldn't continue to use `marquee` or `blink`.