Sorry had to just remind folks.
There were two versions of the NST Crank pulleys.
Version 1
Version 2 like LAVA's example
Can you spot the difference?
If NOT the spacing between the center cutouts are thicker on version 2
Hence the less probability of it failing NOT that it couldn't fail but making it less likely.
I see the failures are from the early adopters while they were on version 1
Hope it clears the air as to why some are failing.
I bought my set as they were rolling out version 2 and have not had any issues to warrant me to want to remove it.