Current gen, no idea.
Back in the day tho - Lineage II. The support class (Buffer) was so damn important, honestly the difference between life and death. Support buffs we're so powerful that everyone wanted a full buff, to the point support's while not doing much we're sitting in the main cities and selling buffs for in-game cash.
Also buffs from different support classes (there was a number of completely different full buff support classes) could stack, and a full party would never be without a dancer/singer class and a more conventional direct buffer. Dacers and Singers did party buffs, the other classes most of the time did single target buffs. But support classes never meant to be squishy useless guys, nope, most of the time they wore the heaviest tier of armor and used dual swords. For buffing however they would switch to decent sets of magic armor and staffs that added casting speed and mana.
P.S - You can still play the game, it's F2P now and is being somewhat maintained and updated. Unless you're going to puke your brains out because of the controls (no wasd, just point and click, tho is supports some sort of wasd but it's poor) there's no reason not to enjoy the game. Graphics are decent for such and old game, performance may be bad even if running on a high end rig, it's due to the old engine.
But yes, worth a try.
After Lineage II I have never seen a game that did support that good, and honestly that's sad.