I really enjoy this feature quite alot. I took a good break from the end of last year due to personal reasons, and came back a couple of weeks before this dropped, so this gave me another reason to continue playing osu!.
That being said, I do hope the other gamemodes will have their own version of this feature, though I am not quite sure how mania would be considering there is both 4k and 7k to consider, and anything else between and over 7k. Seeing taiko for one of the dailies was interesting, but it was atleast easy enough to play and get a good score on it. And having other modes get their own version of the daily challenge would allow people to give it a shot even if I, or other people aren't good at the other modes.
One thing that could see some love are a couple more stats to peek at when hovering over the card for daily challenge in your profile, like number of times you got #1 in. I think it'd be cool to show off how many times someone achieved a strong score that noone could beat for the day. On the daily challenges tab in rankings, maybe there can be a spot to show what mod is forced for that day. Little things that probably aren't relatively useful but can still be some extra flavor added on.
I don't have many complaints about the system (other than having a massive skill issue and having the inability to tap anything over 180bpm consistently, and that there's been three 200bpm ar9 od8 6* maps in a row for day 7, four if we wanna count Unmei no Dark Side, but that's not ar9/od8, so maybe a bit more variety would be nice to see (but honestly I just suck)). The balance between no forcemod and forcemod is nice, the choices for those mods are managable (no scope being the only exception), and the song selection has been strong.
Happy to see this feature existing for lazer. Flashlight daily when? (: