Well that would certainly make sense, except I've already finished Primal Burdens and only got the Summoner's Doublet out of it. No gloves, boots, pants or hat; only Evoker stuff. Meanwhile, both the Scholar and Paladin equivalent quests give the i90 gear during their lvl 45 quests.

Just to clarify: I finished the entire Summoner quest line from before the expansion, and did not get the Summoner gear (besides the doublet) at any point.