Nothing you read in the browser can provide ultimately great and hands-down the best reading experience equally for everybody - the modern web model is inherently at odds with that. A plain HTML page with no CSS is a near-perfect reading experience. The problem is that almost nobody ships that, because the web also became a publishing platform where authors compete for attention. A plain-text protocol under user control is closer to "best reading experience for everybody". The web could be that. It mostly isn't.

I stopped trying to read long articles in the browser. Why would I do that, if I can easily extract all the relevant, plain text (and even structured one) and read it in my editor instead? Where I have control over fonts, colors, navigation, etc. The browser is a delivery mechanism, not a reading environment. Treating it as one is a habit, not a necessity.

Long ago I stopped trying to type anything longer than three words anywhere but my editor. Of course, why wouldn't I? It already has everything I need - spellchecking, thesaurus, etymology lookup, translation, access to all my notes, LLM integration, etc. Try it one day - it's enormously liberating experience. And then maybe you'd stop reading long texts in the browser as well.