It's all down to your own personal challenge ,some of us concentrate on max square ,some on max cluster especially anyone who lives on the coast , some just add number of tiles . I'm sure if you targeted your max square and max cluster by filling a few holes you can increase these very rapidly until to get more difficult as tiles get further away . I now at the point were I have to complete a 100 mile loop to had any localish tiles .Just flicking around and looked at this thread. I never knew the Tile Count was a "thing" Just looked on Veloviewer and I have 7,376 tiles: Max Square 9 x 9: Max Cluster 512
Is that good, bad, average or doesn't it matter?
If you choose to target local tiles and run a computer with chrome os there is an extension that overlays velo veiwer tiles on Strava route planner