The solution is Linux Mobile, where browser becomes the only option as apps don't tend to be available, but it's a full fledged browser so it can use all the appropriate addons. Typing this from my PinePhone Pro with keyboard case, postmarketOS, LibreWolf with the same addon set that I have on my desktop and laptop because Firefox Sync keeps everything synced together.
True, but I was always an old.reddit user even when I used Reddit and Android (Firefox on Android). Now I use mlmym.org on my PinePhone. The experience is pretty much the same, except now I have a keyboard to type faster.
You can install Firefox Nightly and setup an addon collection on the FF website and use pretty much all desktop addons on your mobile Firefox browser. Then you can install TamperMonkey and search GreasyFork for custom usercripts that add enhancements to the website.
Or I could install Voyager and have a better user experience in 5 seconds. I love Firefox but the mobile experience is highly dependent on the care a site puts into their mobile site.