old.reddit.com works fine for me on mobile. I use it every day. (Granted, I have the iPhone with the biggest screen available).

Tildes.net is meant to work well on mobile web but I still get a vibe that there would be a large group that would appreciate an app for it. I am undecided myself: notifications in the notification area were nice (back when I used reddit is fun, 13 days ago) and things felt more... native? Fast? Behave as expected? But it's not like it's essential.

I find the mobile web interface is decently usable … except for all the ways it tries to shove the native app down my throat.

(I'd rather use the web interface on mobile and desktop, so I'm not sure the original criticism applies to me, either.)