In case there's anyone who isn't frothing at the mouth over Patch 5.22:
Masteries are "watered down" because of sustain. Champions need to be able to survive laning phase in order to be playable so they added numerous sustain masteries, and removed many of the alternatives to them.
In Season 7 I can't see Riot not purging masteries of sustain and putting it into Runes when they rework those.
: I feel unaffected. Also not frothing at the mouth...was checked earlier this month.