This i so 100% the opposite to my experience, that i would believe, the issues are caused by the user or the whole story is not true.
This is absolutely no offense to you! It is just to make clear, how your words apear to me.
Interesting, that you have had that things happen. I use axis since 2003 and never had any problems with the omegas.
I never had any problems with dirt or debris or pocket lint. I never had since i can clip pocket knives onto the seam. I have taken the knives apart and found little to nothing in the slot for the springs, after one or two years. Debris was kept up, so you can easily blow it away (as i was using a 110 - type of folder, a blow out of debris off the blade tang was the first i did, any time, i mean any time, i get the knife out of the pocket. Do we know, what we are talking about?)
The axis itself will not take much debris, maybe except the pocket has become a sand box.
Thats caused by the user.
I use the 520 as my favorite axis folder. I can imagine, what is meant by blade play. But this can be solved easily by tightning the pivot. Nothing exotic, nothing new. Unbelievable, you can´t have solved that. Unbelievable you have found others like that, one for the next. None, that i get, was that way. None.
100% the opposite to my experience.