Why does that matter as long as T5 gear doesn't easily overpower T5 encounters? So what if T5 makes you OP in T2 & T3 raids and regular K6 dungeons? Why would you bother doing T2 and T3 raids on a T5 toon, unless you're just helping a friend?
The gear should fit the tier, not lower levels tiers and dungeons.
-> DT:Stiraqvcrn; Necro:Munyidora; ToS:Stiraqvaa; Guard:Stirameco; BS: Stiraqcanya, ...
If you see one Stira wipeing a group or a raid Its me