Having tried /r/politics, /r/eve, and /r/valheim, I was going to point out how I didn't get the screen you got. However, /r/nyt gets this message. As an aside, /r/politics, /r/eve, and /r/valheim are verified while /r/nyt is not is interesting to me. Upon further testing, /r/nytimes works. Seeing how /r/nyt has 411 subscribers, while /r/nytimes has 8,431 subscribers, I think smaller, less well known subreddits will run into issues while larger subreddits or subreddits that are more well known will have no accessibility issues.
It's also interesting that this block doesn't exist if you navigate to old.reddit.com/r/nyt instead of just reddit.com/r/nyt. You think they would have just repurposed the page that asked if you if you were over 18 before going to a nsfw subreddit for this task, but old.reddit.com seems completely overlooked as of now.
old.reddit.com on the Firefox Android app looks bad, but I wonder if someone could make an extension to automatically redirect users to old.reddit.com when navigating to reddit.com, as well as an extension that changes the layout of the page to something more mobile friendly, similar to RES but for your phone's browser. That might make reddit usable on mobile without the official app until old.reddit.com goes away or they try to implement some sort of user agent string check.
You think they would have just repurposed the page that asked if you if you were over 18 before going to a nsfw subreddit for this task, but old.reddit.com seems completely overlooked as of now.
Doubt it was overlooked. I moderated a larger subreddit and I can tell you that the stats for old.reddit are tiny compared to the rest so it's not worth the cost of implementing. Further if you use old.reddit you probably already have a dislike for the app and will rather abandon the content then install the app. Finally old.reddit is used more by old-school redditors which tend to be the vocal minority that will complain about the change the loudest. So overall, ignoring old.reddit is propably the smarter decision from reddits perspective... ¯\_(ツ)_/¯
I have the extension "Old Reddit Redirect" in my firefox mobile. You need a version with custom addon collections enabled (beta or a fork like fennec on fdroid), then you can install every addon by adding it to your collection, and most of them work.
If RES or an equivalent addon could produce a good mobile layout you could use them in the same way, but I don't know about that.