Druids have the HoTs, sure. We shouldn't spec Body & Soul because we shouldn't have to cast Power Word: Shield, either. Discipline has the absorbs. Multi target heals? Those've been covered by Shaman since vanilla. Single target thoroughput has been the Paladin's forte since TBC (vanilla they were buff/cleanse bots). So basically, everything is already covered. We obviously shouldn't be casting anything magicism.
With your comment about talents affecting what, Survival talents still affect melee to some degree (as does Aspect of the Beast). Our Holy talents still have a heavy bias towards Greater Heal. What for?
And as to:
You must be talking about the retarded red-headed step children that play Disc on these forums, spamming Shield.instead of binding Friendly Tab and 1 to the same macro key on your logitech keyboard, setting it to toggle on and off and then going and making a cup of tea.
Replacing Renew with Flash Heal does not equate to less skill, nor do you try to HoT up the entire raid. You focus where you can on a couple targets, with constant healing going out instead of sporadic bursts bouncing between one to three targets and nothing inbetween. Countering a DoT with a HoT is the most useful utility as any healer, set it and mitigate (or in some aspect neutralise it altogether) the need for additional incoming healing.
Instant heal + 1 tick = 80% of a noncrit Flash Heal, for the same mana cost. Plus you can apply while running. Then you bring into the fact that there's 3 additional ticks to buffer any additional damage from DoTs or other AoE raid damage effects. If someone needs more then you bring out Flash Heal or your other tools. It's powerful, and should be used to its strength. Spamming Flash Heal is a weak excuse pretending to be a Holy Paladin on raid healing, instead of the Jack of all Trades that we are.