A large part of the problem seems to be inconsistency. During my 300 mile round trip, I used AP, TACC and NoA wherever I could. (and sometimes where I shouldn’t…)
I passed large curtainsiders, went under dark bridges, encountered large shady spots and not once did I get a PB, even mildly. I always had my foot covering the throttle just in case. Even all my lane changes worked first time, every time.
Even when a car joined the carriageway beside me from a slip road nothing happened.
And yet, in another Tesla the results could be completely and alarmingly different.
On another drive somewhere else, I could easily be plagued.