I love driving my M3P, but it's far from perfect. I drove my A6 the other day and in some areas it knocks the M3 into a cocked hat:
Adaptive cruise control on the A6 works perfectly. It's much smoother in braking and accelerating and phantom braking is virtually non existent. TACC, on the other hand, is barely fit for purpose. It has but me into downright dangerous situations by slamming the brakes on when I leave motorway lane 2 for lane 3, almost causing the driver behind to run into me at speed. And Elon says FSD will be feature complete by the end of the year. Yeah right!
Headlights - My A6 has matrix headlights which are absolutely brilliant and one of my favourite features. The M3 just has automatic high beam which is far too slow to respond. I've often been flashed by oncoming drivers who are blinded by the slow responding headlights. Even the new Corsa EV will have matrix headlights, while the supposedly technically advanced M3 can't manage it.
Automatic windscreen wipers on the M3 are also not up to scratch. They are not nearly sensitive enough, and it's the first car I've ever owned where the sensitivity can't be adjusted. C'mon Tesla - this is basic stuff!
Comfort and refinement at speeds of over 60mph is in a different league in the A6. Wind noise and tyre noise are very muted, and the cabin is an oasis of calm. In the M3, however, wind noise and tyre noise (especially on the 20" rims) is very intrusive at motorway speeds.
Head Up Display - people promised me that I wouldn't miss this, but they were completely wrong. There's nothing so convenient as having key driving information written, so to speak, on the road in front of you.
I still love my M3, especially for the performance. However, I recognise that I've also sacrificed a lot. I won't argue that the M3 is the best EV on the road at the moment, but in terms of automotive technology rather than just EV technology there are many areas where it doesn't even begin to trouble the competition.