I mean..damage is 40%..why not do healing 40%*? Calling for 50% (max) heals would totally screw over MAs/traders, as our best heal (ma) is ql 140ish...and is crap post 175+...50% heal would mean at BEST, a high lvl MA could heal 250-500ish points of damage every 8 seconds...which isn't a whole lot better than the soldier heal...and everyone knows how bad that one sucks ;P
Please also bear in mind that the MA heal has a RECHARGE- of 8 seconds...thus it cannot be improved by any means...and basically locks the MA down (no root breaking, switching bracers, debuffs, rebuffs, ect..) for the alloted time.
40%* heals would ALSO mean that docs would have to heal in pvp more often, as opposed to just waiting until they have 1000ish hitpoints and complete healing to full health, (saving nano and giving them extra time to pull of a couple extra shots/debuffs) ...they would have to heal much SOONER and more often (thus giving them less nano for init debuffs and DoTs, making the fight a bit more balanced)....yet 40%* healing wouldn't affect the trader/MA heals...I don't think I need to explain why either of those heals shouldn't be nerfed (yah suicide heals ) =P
With the upcomming reflect nerf, I don't think an explanation/excuse is needed for the heal nerf...I know that i'll never pvp a doc who can crit for 1300+ and full heal 4+ times (approx 40,000 hitpoints in total). :/
Just my 2¢
* = 40% of max health, not 40% of the total heal.