I prefer simple, minimal user interfaces rather than flashy, in-your-face ones. Some prominent websites offer, but don't advertise, such minimal UIs. They depend way less on javascript (less javascript is always welcome). I think they still have them mainly to support old, low powered devices. But the truth is that they are useful on our modern devices too. We can conserve our phone/laptop battery power by using these old-school, minimal UIs instead of their current bloated websites and apps.
Here's a list of such minimal UIs.
Reddit : https://old.reddit.com
Duckduckgo : https://lite.duckduckgo.com/lite
Qwant : https://lite.qwant.com
NPR : https://text.npr.org
CNN : https://lite.cnn.com
Twitter : https://mobile.twitter.com
Gmail : https://mail.google.com/mail/u/0/h/
By the way, if you are using Firefox (as you should!) and are reading an article of sorts, you can turn on reader view by pressing Ctrl+Alt+R or tapping on the little page icon in URL bar. Reader view removes all useless clutter from the page and lets you focus on reading the article.