they're trying to fix holypaladin mastery, it's still going to be our worst stat by far and everyone will reforge away from it still. Yeah sure this will make holy paladins more OP.
Frost mage buff is needed since frost mage dps and damage in general is lower than the average dps. Even though burst might be OP just like retri paladins burst frost mages and retpaladins are in the same boat where the burst is somewhat insane where non burst is shit.
And no Holy Paladins are not the most OP healer in pve or pvp. Priests are best but not at all OP.
In terms of healing throughput:
Priest.
paladin
druid
shaman
Shaman could see a minor buff in terms of getting a throughput cd, aswell could druids.
Next patch both druid and shaman will get a new ability/lowered CD and atleast for resto druids that will change ALOT of the "hps" shortage.
Bet you didn't know that Paladin heals costs 1.8k more mana than any other heals from other healers. Next patch it's going to be reduced to 900mana differance which will help more with mana management for holy paladins.
Can't speak for the whole paladin comunity but whenever I have to spam heal in some encounters like lastphase Cho'Gal I'm the first of the healers to go out of mana simply because burst healing mana cost is way WAY higher than other healers.