Some changes you can't help - some slabs would never have been done because they're completely covered in moss; and some holds come off regardless of whether you lever them or just try to use them.
Maybe the difference is some people are willing to clean a line of moss off a spectacular looking but completely covered slab, whereas you'd prefer just to not climb it?
(that's a presumption, but I can't see anyone getting excited about slipping and sliding on dirty moss)