Muscle memory, having the cursor / aim be an upredictable variable depending on the speed of the movement feels very wrong to me.
Floaty feeling, one of the things I try to do first with every Bethseda game is to try and force raw mouse input, otherwise it feels like I’m trying to control a mouse cursor that is sliding on ice.
I have not tried the RawAccel druver you’ve linked so can’t comment on that.