Interventions are more nuisanced than just "Did the driver intervene". Many times I intervene and take control while using Tesla FSD not out of safety reasons, but to be nice to other drivers, or for a smoother ride. It tends to love passing other cars on the right and not letting cars into merges, for example. It also brake a little hard at traffic jams, for instance, not nearly to a point where it would be a safety issue, but when I see a traffic jam far ahead I would begin decelerating much, much earlier just for the comfort of myself and passengers.
That said, FSD is nowhere near ready, I do have a huge number of safety related interventions as well, but reducing this to a number like L3 or L4 is trying to oversimplify a problem that isn't simple.