@Riot: Philosophy Behind Utility Mastery Changes?

5/18 PBE Update
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Yesterday we got some interesting Utility mastery changes on the PBE, with the Meditate 3MP/5 being replaced with +75 flat mana, and the 5% bonus max mana masteries being replaced with 1.5% missing mana regen/5. On the one hand, this seems like a buff to supports who needed mana in the mid to late game and didn't get to build any of the major mana items due to role / money. On the other hand, for champions that went 21/0/9, as lots of mana intensive mages in mid do, it seems like a significant nerf to their early game. 3MP/5 eclipses 75 total mana in slightly over 2 minutes, so you can expect to have less overall mana to work with during the laning phase now. So I'm really curious to hear what the philosophy behind this change is. Is it just to standardize mana regen into a percent based model? Is it to buff those supports? Does Riot feel that mana intensive mages needed an early game nerf? Will they be compensated?
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