Bruce, I think you are right. They were not as dependable or as long lived as some of the other brands,however, they always cleaned and rinsed well!
I think it was a great blue-collar workers machine. Field hands and working farms and dairies, factories, lots of active children's clothes. Loads full of unionalls and jeans were no problem. Oh yeah, just be careful with delicate items! Even on low-speed my '62 will thrash the hell out of everything. I use it like a Fabric-Matic alternating agitation with soak, manually. The solid-tub machines had a lengthy spray-rinse in the first spin and went right into the rinse fill. From there about 4 minutes of overflow rinse. There was another spray rinse shortly after the throw-out in the final spin. Very thorough cleaning.
I think they were better at cleaning than the solid-tub SQ machines, many of which had abbreviated first spins and over-flow rinses in commercial laundries.