I'm not sure that I understand at all the problem that so many seem to have with fraying and shedding.
This last, SFS, unit that I just switched out of (and the only reason I changed out of it is I'm wearing my hair longer now), I wore for 10+ months with NO fraying and NO shedding.
I also have very, very little color fading or color change (1B with 30% synthetic gray).

There are things that I don't do and do that others here do differently, for sure




Fred