So much of unnecessary fluff.
Giving combos with buffs is not the answer to anything, people hate them especially one digit % buffs. Human perception regocnizes change starting at 10%, anything below is something that you wont notice.
Tank mains would start a revolution after all those changes, not only you are tying their gameplay to trash buffs, but also making fun of them, here waste 10 seconds in order to apply 2% dmg buff, really. xD
Reddit would blow up with memes.