Great to have the input from an actual user!
i've owned 3 A90's, and now own an Anna.
i did compare one of my low hour A90's to a friends (a tonearm designer who plays his all the time) high hour one (well in excess of 1000 hours) and no difference in performance that we could hear. we did it so he could know that his was still ok to use as a reference.
Downunder and i have had this back and forth a couple of times on multiple forums. until he actually compares his 1200 hour A90 to a low hour one he/we won't know what is up.
all diamond stylus's wear at the same rate. the issue is that the wear is even, not that one shape wears less. if your cartridge is not aligned properly then un-even wear could reduce effective life.
the whole Replicant 100 wear 'buzz' is baloney....and partially a result of mis-leading info on the Ortofon website related to the fact that Ortofon makes cartridges at so many price points that they did a corporate CYA statement. some people picked up on it, connected the dots, and started the buzz.