It is usable on mobiles, that's what broke for me. Punch in to zoom to "home", pinch in to upvote, different levels of text.
At home, on my laptop, I use Reddit as before on the old design, but on my cell phone? No chance. So in that area, Mastodon/Lemmy/KBin has taken over my Reddit usage, yes, completely.
Well, on Twitch and YouTube and Reddit, I'm settled.
On Twitch, I never visit front-page. I follow the channels I follow.
On YouTube, I watch the subscribed channels (and recommend videos. If good, I follow).
Reddit, I don't visit All or Popular. I have the subreddits I wanna follow.
On Lemmy, it's so new that I haven't found all the places, so I go to All on Local and see what's up - like I do now.