I'm not saying AP2 can't do blind spot detection with its cameras, just at this point Tesla created trigger to gather snapshots for AP2.5 cars only.
So what you were really saying is Tesla is gathering blind spot data from AP2.5 cars, not that there is a blind spot feature that currently only works on AP2.5 cars. That makes much more sense, as it can probably get better data from the AP2.5 repeater cameras, and that data would be applicable to AP2 cars as well.
In other words a big nothing-burger.