Eh, we still don't really know if MCAS is the cause of the Ethiopian crash, though. Some things point to it (flight fluctuating up and down, jackscrew found with full nose down trim), but some things are different, too, like crazy acceleration and handling issues right from takeoff, when the flaps would still be up and MCAS inactive.
Even if it Egyptian Air didn't crash their plane, Lion Air investigation alone exemplifies systemic negligence, not from the software standpoint, but from the top-down executive level and the negligence of the FAA.
So, your point is valid about that we need to wait for Egyptian Air's investigation, but misplaced because of the aforementioned argument.
