I'm honestly starting to get a little bit bitter that this "system" was sold to me.

Given the fact that the frame is stuck with it unless I put in a sleeve adapter, I think that Cannondale should either be responsible for bearing the cost of the upkeep, or should give me a frame with a traditionally threaded bottom bracket shell.

Except that it's Cannondale, and all their better frames have this crap bottom bracket. Maybe it's time to put it on e-bay.