As I've said, it doesn't really work that way though. Say you need 300 hit (using arbitrary numbers here) and your tier set provides 250 hit and you get the rest from gems and jewelry. Everything's cool. Now a new patch comes out and your tier set has 230 hit. No problem. You get rid of some of the gems and jewelry. Now a new patch comes out and your tier set has 240 hit. Now you curse Blizzard every time an item drops with hit on it.

In short, later gear has more of the same stat on it. When the stats are easily capped, the larger pools become hard to work around. I compared it today to playing Tetris with really large pieces. It's hard to make the puzzle work.