I mean BLU is far from overpowered, they only have like 3-5 spells that make them "overpowered" which could totally be balanced.

I think the development team should take a chance and allow them to do party content while nerfing obvious op spells.

Would be nice if this happened in 5.1 it Could be considered BLU beta phase while preparing them for 6.0 lv90 cap.