Idk about doing nothing but dps dk have most of their utility and survivability tied only to them.
There only real group utility is an optional talent in anti magic zone, everything else is all about keeping themselves alive and ignoring mechanics so they can keep dpsing while ignoring the rest of the group. They get left out afflicted and incorpreal weeks cause they just dont have any options to handle them (sans sacking their ghoul and mind controlling once a minute)
Every class has some group stuff though, intterupting, stuns, cc, brez/heroism stuff like that. Its a mechanics based game, no class is going to have nothing for every mechanic.
Minus having a raid buff and a major defensive CD (Rallying Cry)…
Literally, what? Ret paladins bring big off-heal potential, BoP, Sac, Freedom… What more do you want? You have more than almost any other DPS. The only way you’re not bringing utility to the table as a ret is if you’re choosing not to use any of the myriad options at your disposal.
It’s also worth point out that it’s only “selfish” if a spec has options available and the player chooses not to use them. Can’t blame the players for warriors inability to handle affixes–have to blame the devs for that one.
Double also, doing damage as a DPS is not selfish. That’s their job. Bosses don’t die if the DPS don’t do dam.
Basicially, all classes can be just don’t do interrupts,don’t tw -lust,or do so regardless of when and where.Just hit the target forget everything else.