The question is why are they so bad??
The bearings are the same size as HTII and they are inside the frame so you would assume they are more protected. Also you don't have to worry about frame facing issues.
Know what you mean but they must - de facto - be more poorly sealed than other bearings. My non-engineer's brain thinks it's something to do with the fact that when laid flat on a table and viewed from above they are wide in circumference but the actual bearing is narrow ie the outer and inner circumferences are quite similar. In my opinion that gives a small area in which to put an effective seal and it is therefore too difficult to engineer an effective one?
Could of course be that PF BBs were just brought across from road bikes without modification (ie expense), or is that being cynical?
Edit: the Hope system looks ok but still puzzles me why we have to buy aftermarket systems to get any longevity from a standard that is supposed to improve our lot.