Think P-Jay is right. This stuff just wasn’t ready or tested properly before hitting the market.
Myself and others have had the chain come off the lower jockey wheel and get wedged between the cage and jockey multiple times for no reason. Drivetrtain stops dead, mech bent, no longer shifts properly. They now come with a revised jockey wheel design.
At just over 1000miles I had the chain snap, no the links didn’t pull apart, it snapped. Upon closer inspection it was cracked in 2 other places. I’ve never seen anything like that. This is a chain that’s rated to hold up the weight of a Toyota Prius.
Wear in the jockey bearings and mech rivets results in play that causes poor shifting. Never had a Shimano mech develop play in the rivets.
I believe Shimano still have a lot of the patents on shift ramps so the Sram stuff won’t shift as good anyway.
On the whole, fiddly to set up with slow and clunky shifts.