Reddit is horrible to use on mobile devices as well. They're trying to force you to download the app, but I'm not interested to download an app to browse a website. I already have a browser.
i.reddit.com still exists as a really dumb mobile version. I use it when my feed reader takes me to reddit sometimes.
If you're signed in there is also an option to disable the mobile nag in the settings (and set dark mode if that's your thing). Not as lightweight but also a one and done.
This is still my favorite reddit mode! It does seem to hide posts if you click the link, which is super annoying.