Blizzard designs each spec primarily for its role and tries to use the class for flavor and theme. It is role first though. Holy is a healer, and as such cannot have worthwhile melee abilities because encounters are not designed to support healers preferring to be in melee because they get a noticeable boost from it. That is why they changed SoI to not return mana.
And no, this has nothing to do with not accepting change, although I'm not sure if me saying so will mean a damn thing to you, Duke. Change is fine, so long as it's in the best interests of the game and community. Changing prot and ret to key primarily off strength in WotLK was a good change because it made gear more accessible and unified mechanics which made things simpler for Blizzard to work with thus they could give it more depth and polish. Changing holy to want to go into melee, even if it's a "style" preference born of a talent or glyph option, will be for the worse because it runs counter to the role design and would cause more actual problems than solve the "style" problems a certain subset of the community thinks exists.