It doesnt matter to Mainoo. It matters to us. Else why do you have 3.4k posts?
Mobility is far too broad. He's not the fastest, but he runs. He makes runs off the ball, he runs back to help defend. He's probably never going to be that quick but in his position he doesnt need to be as some of the best CMs were not.
To be honest even against City where I thought he had a decent game he hardly "ran". Watch his highlights. He mostly trots. No reason why he shouldn't be able to work on this like Dorgu did with a personal coach

It reminds me of the tweets that go "Bruno Fernandes is the only player in the top 5 leagues that has created 50+ chances, taken 22+ corners, 37+ ball recoveries and 15+ tackles. Maestro".