Re: My back wheel bearing exploded!
That's awful. Glad you are ok. I think it may be possible that the cones were too tight in your wheel. I agree, loose-ball bearings are good, no cage to deform or interfere. The cages are used to simplify assembly and maintenance, since coasters are generally used on low speed bikes that won't see a lot of use or maintenance.
1" roller Dax Friction Drive and Tanaka 3300 with mods.