Whatever happened to 100 pound plates......a bitch to load a bar, but great for super strong guys......I haven`t seen any in many years.
They still show up a little here and there, but when they started moving to the thin calibrated plates, they started to disappear. A lot had to do with the loaders, both in OL and PL. Many can't handle the 100s or 110s, and would rather load two 45s and a ten or two 55s, etc....
They also stopped using the green 55kg plates in OL competition back in the 80's because a lot of guys just didn't like how they felt during the lifts. But they might come back, they're running out of bar space for some of the bigger lifters, so there's a pitch to bring the 55kg plates back or make a new weight size.
I think the Paralympics have experimented with #60lb plates at a few competitions.