Bonham’s death was brutal. That man was unparalleled on drums. Saw Zep on their very last tour when I was all of 13. I was a drummer. Bonham was mesmerizing. So tragic and pointless a death.
On a different level, Bonzo's death probably secured Zeppelin's status in rock. By 1980 their live shows were pitiful, In Through the Out Door was their second weakest album behind III, and punk etc was taking over. Had they continued in their sorry state their legendary status may have been jeopardized. Again, I'm not happy Bohnam died, but that may have helped with their place in rock. To wit: Aerosmith *MAY* have fared better in the annals of rock had they quit before Night in the Ruts.
As a drummer, I agree he was for the time. However, Ginger Baker of Cream started the duel bass drum hard hitting rifts and fills (think Sunshine of Your Love). Until Baker, that sound didn't exist with all the British invasion bands. Bonham perfected it.