Some builds, even with full set-support, perform poor.
Other builds, even without set, perform very good.
With right gearing I see no problem that a fire AAR templar can farm SR 75-76 in ultimate.
https://www.grimtools.com/calc/gZwGXRjZ sketch I made, which I based on adoomgods sorc [1.1.4.0] Xiuhtecuhtli the God of Fire AAR [c+][sr75+] - Sorcerer I did play similar as presented above a few patches ago it felt strong as any other AAR build (save for aether spellbinder which is in its own leauge)
Edit: dragon beat me to it