You’re right, partly, T5 gear is much like T4 but for HoX the rune is crazy. The T3 crafted 2HB remains silly to this day and T6 blew the whole thing if you want to be a pure glass cannon. I hate the raid finder rings with a passion (those and the chaos rings should have like, -10,000 PvP hit rating on them so you can’t use them at all). But as the OP is mentioning RF gear, it mostly means, to me anyway, T4
I’d suggest that the issue that came out of T4 gear was that it necessitated buffing the holy hell out of PvP gear and sending the crit on it through the roof to be on par with it. I quite hate that as things were in a nice place in Khitai days, with real drawbacks to using the DPS Khitai gear > the defensive PvP gear (for anyone really except maybe assassins but full BB gear wasn’t a great idea either). The issue to me, in those days was that you needed to raid for any good weapons.
Hey if they could do unchained minis with the gear reverted to the lower DPS of those days and everyone forced to use it, I’d be really on board with that.