What has likely changed is the threshold for AEB/ACC radar braking
I agree. I've had several braking events on 14.2 (AP2) where I would not have expected to have them.
On the plus side, approaching slower traffic, the car appears to brake sooner and more gently.
More subjectively, I also think cars appear in the binnacle display earlier than they did before (smaller) and when further away are more often in the correct lane.
At some point the radar and vision systems need to become more integrated so even if the radar detects an obstacle, the vision system may be able to plot a way round it and thus avoid braking. I think both systems need to be looking further ahead to achieve this.
Speculation on my part is if the increase in sensitivity is because the threshold has simply been tweaked (perhaps as a result of the fatal accident and the car not reacting to the concrete barrier) or because the system is starting to look further forward to plot routes around obstacles. I've seen reports, but not experienced it myself, of the car moving over within a lane, for example to go round a parked car that is jutting into the lane.
I’d use the support email on MyTesla. 
