BMW did lower the regen maximum because they had too many new drivers that didn't understand it, and tried to drive it like a typical ICE, creating whiplash when it went into full regen (higher than available today). Personally, it took me about two stops to figure it out, and I liked it. In the process, they also added a slight delay and ramp up of the regen versus the original's immediate response.
When the issue with motor mounts was discovered, they dropped out acceleration when they detected one wheel or more having rapid acceleration relative to the other wheels...IOW, the drive wheels were slipping. OFten the result of hitting a bump or say going over a curb. The possible rapid acceleration of a wheel when it then hit the road surface again, could put a significant sharp impact into the drivetrain as it slowed back down. All of the vehicles, assuming the recall was done, have this now. Personally, I think the issue did not come up when testing in Germany since they tend to have pretty well maintained roads. Many other areas may not.
So, as far as I know, maximum acceleration has not been dialed back except for one of those (hopefully rare) situations when a wheel ends up spinning in air.
Note that the curve and response changes if you choose one of the ECO modes.