I understand bearings are fun, and hey, honestly that's all the reason a person needs to warrant enjoying their knife and i totally respect that. I'm just trying to make the point that you might have bearing knives that flip and last a while, but in no way shape or form are they a structural upgrade to any knife. Imagine doing a handstand on your 5 fingertips (if it were possible) and then do the same with your palms flat against the floor, easy to see which would be more supportive. There may be better options in terms of maintenance and long term abrasion between surfaces (bronze vs nylon based washers etc.) but washers of any kind are still better structurally than bearings. It's just more moving parts to worry about, contact surfaces need to have an interface to stop wear, and they simply haven't been engineered well enough to last long term if used as a work knife in my opinion.