most tablet players don't snap on fast patterns (elysion/hvick225/wubwoofwolf are good examples), but others do (rrtyui, Cookiezi, Rucker). I think it looks 10x more badass when you snap to each note so that is why I think it's worth learning (and I also think it's more consistent in the long run; if you can snap to every circle in every position even at high speeds, you will rarely have a pattern you "just can't hit")
If you want to see extremely non-snappy playing, watch Silynn replays, it always makes me wonder how he even hits the notes