Re-reading that, I didn’t write very clearly - and thankfully my car doesn’t require braking to stop accelerating indefinitely.
What I meant was, in a combustion engine, there is still some acceleration that occurs as the engine drops from 6-7k RPM down to idle. If you’re running acceleration from 0-60 in 2 seconds, that continued acceleration after you take your foot off the gas and the engine runs down to idle may be another 10 mph. In my experience, acceleration for a combustion engine to hit its best time is usually pedal to the metal and isn’t a smooth stop at that exact top speed (which would require letting off the gas ahead of reaching the top speed so you don’t overshoot).
In context of the parent and regulating speed vs acceleration, my point was that fast acceleration can lead to people overshooting the intended speed / speed limit.
That said, power delivery for electric motors (that would be in the 2-3 second 0-60 range) may not have this ramp-down period, so acceleration would stop immediately (and maybe slow down aggressively with regenerative braking).