Kind of a weird question (the title isn't that great either, couldn't think of anything better) but I'm curious of this. Just how/when do you determine if you should 2-heal fights or not? I ask because my Raid Leader basically refuses to even consider the idea of 2-healing; we 3-heal every fight in Throne of Thunder, and I'm pretty sure we've always 3-healed even as far back as Firelands. I'm not sure if this is because our healers aren't that good, or just to "play it safe", but since I always see people talk in other threads about using 2 healers it keeps me wondering if my RL is hurting the team by not using 2 healers and, if necessary, calling them out or even replacing them if they can't keep up if 2-healing is the norm. It's something that lurks in the back of my head because if we are meant to 2-heal fights, and most 10-man guilds 2-heal the fights, and we try and wipe due to not enough heals, than IMO the solution isn't to just say "Okay we 3-heal it instead" it's to find out why our two healers can't keep up, when other groups' healers can.
Having said that are there any real guidelines for when to 2-heal versus when to 3-heal? For instance, Megaera seems like a lot of raid damage, so 3-healing that fight would make sense (to me anyways, maybe it's doable with 2 as well but just saying). But a fight like Jin-rokh or even Horridon or Tortos doesn't seem like it really requires 3 heals, and the loss of a DPS makes the fight go longer, etc. but mentioning that tends to get a "We beat it with 3, why try 2 and risk a wipe?" which I certainly understand but it seems detrimental overall.
FWIW Our typical healing setup is a Resto Druid (Balance O/S), Disc Priest (Holy O/S) and Holy Pally (Changes his O/S all the time), with the rest of the raid looking usually like: Prot Paladin (me), Guardian Druid, the three healers above, Shadow Priest, typically a BM Hunter and then three from: Enh Shaman/BM Hunter/2x Destro Lock/2x Frost DKs depending on who we have on and available for raid.
Also this is specifically in regards to Normal mode.