2 reasons, because holy is easy and fun to play (well i find it fun atleast).
secondly, disc is usually a strong boi and the best performing specs usually do see more playtime
edit Think I ment holy is likely the most beginner friendly of the healer spec’s. so will likely see a large number of people gravitate towards that, rather than the other choices when it comes to picking a class/spec to heal with for the first time
Sir i know you are on a redemption against Priest because a fear dont break
But i got news for you Blizzard are NOT reading the forums and balancing arround complains there
See Pls nerf Priest i feel way too OP my fear dont break on damage and i win too much pls Blizzard nerf Priest
Nothing will happen the pull up charts from raider io, warcraftlogs or use there own tool for balancing, eaven youtube vid with million views get ignored by Blizzard