So, I'm leveling my priest to 100, and I'm really enjoying it. I've come across something strange though, apparently I "need" to heal as disc? I've been told that three times now as I healed, perfectly well I might add, dungeons as holy. I personally like holy, I prefer the play style, and I've healed as disc before with no problem at all. I honestly like Disc, but I want a DPS off spec to leveling, raid, etc, and I prefer to heal as holy. Are holy priests accepted into raids commonly? I know disc is nice for the absorbs and all the other perks, but is it really a requirement that any healing priest go disc over holy?
PS. obviously I know it's not an actual requirement. I'm just curious as to why it's hard to believe that a priest would want to heal in holy.