Why only Blitz games?
Titled players play their serious stuff in tournaments. Online is just for fun or to test out new openings, or other stuff like that.
Also strong players dislike long time controls online due to cheating. It's possible to cheat at any time control, but by playing speed games, you can avoid >99% cheaters. Most cheaters don't even know how to cheat at speed chess, and nearly all the ones who do know how don't know how to do it without getting caught.
And I'd guess the great majority of my wins were both on the board and on the clock. I know a few times I did the stupid BS thing of running out their clock when I was dead lost, but that was only a few times in ~50 games.