It's relevant because in the daily situations of most of the planet a Tesla owner will dominate in traffic lights etc. Theoretical top end speed is useless unless you're on autobahn or on a track.
Having good acceleration is good to have at traffic lights. Having great acceleration is good and more important to have when you are already moving.
If you arent on a racetrack from a dead stop acceleration is really only good for jollies and if you want to pop out and change lanes to get in front of the guy along side of you. That is if you are lucky enough to be the first at the light
How does it accelerate from say 40 or 50 MPH? Acceleration is more important in passing situations when you are already moving. Ive also been able to accelerate myself out of problem/dangerous situations where braking (another important feature) or doing nothing and maintaining my current speed would have meant disaster.
Jumping from zero to 60 may be wow cool. But being able to jump from 50 to 70 is far more useful