Anders_ASUSIt's a personal opinion and everybody can feel differently. For me those vibrations in Asphalt were only ruining the game. They were distractive and ruined my reaction times. Vibrations in the screen when I have to touch it were not a good thing. It's in conflict with the low response time of Rog 2. So I switched them off after couple of races and never looked back. A gimmick.
OnePlus has manually tweaked specific games to vibrate on specific sounds (I believe this is the trigger, but I could be wrong).
Anyway, our vibrations in Asphalt 9 were decided by gameloft so in their mind it shouldn't vibrate more than what it does (if you have enabled vibrations in the settings).
But we're aware that OnePlus implementation of vibrations in games that don't carry any official support for their devices is still quite successful and we're looking into how we can do something similar.