Just some basic truths related to this topic:
1) Old school gearheads (which I am one, BTW) tend to doubt new stuff and like to poo poo new stuff.
2) Any moving part can fail for reasons totally unrelated to it's original fitness and suitability for purpose.
3) The ball (Green) bearings were originally designed as a stock replacement for the tapered (Timken) rollers.
Will tapered bearings better withstand lateral force? Of course. How much more and how much is too much? You'd have to ask the bearing designers. Kinda like a 400hp car being 2 lengths behind a 500hp car? They're both getting the job done pretty well and they both have about the same chance of hitting the wall after the driver screws up.
