Not to be confused with touchscreen, I don't have mobile osu! anyway. I mean like, an actual drawing tablet for osu! but it's an iPad pro and an apple pen.
You can roast me if you think this question is stupid
I put miso soup in my bottle. It's nice and filling after a hard workout. Plus, it even helps warm you up after you get chilly from sweating so much.
Classic tablets are usually not as optimised in terms of responsiveness and accuracy as products specifically designed for drawing or playing osu!.
While it is definitely possible it is expected that you will find it less effective than a mouse on more difficult maps.