MRB - the standard tub models lived longer? Why do you say that? I'm curious - not trying to argue with you, just curious what your reasoning is.
From my perspective, the standard tubs from the 60s and earlier 70s were TOUGH on bearings. A well used machine almost always seems to need them badly. I have not come across as many large tub machines of the same era needing bearings, at least not badly enough to interfere with machine performance, but that's just my experience.
These short-post 1978 and later machines never seem to wear the bearings unless they've been wet from a flooded centerpost. There were not that many standard tub machines or models post 1978 so comparisons are hard for me to judge, but I think overall the later machines, centerpost flooding aside, were/are much more reliable than the earlier machines.
G