One thing I don't think has been said about using start assist sprays is that with Diesels the spray should be sprayed into the intake with the engine turning Not stationary. Petrol engines should be sprayed into the intake with the engine stationary and then try to start the engine.
I am not going into the rights or wrong of using easy start. But it can be a good diagnostic tool if you know what your looking for.
Plenty of trucks and heavy plant use ether starting systems. I wish it had been on the heavy plant I was having to start at 6am on the top of the pit stack in the middle of winter.
As for tales of start spray breaking rings how do we know its the spray that's broken the ring and not that the rings have broken and then the spray used to get the engine running. Then when the engine is finally pulled and broken rings found the spray is blamed for breaking the rings.