Ofcourse the colorschemed bars make a diffrence, even the mainstream wow tournaments have it as the only way to see what class people are in their stream UI. Couple of days and u know all the colors by heart. So yes, other games put systems in place for countering the confusion. Another example is that u cant change vanity without going to the NPC. In conan you would be able to change vanity on the go, in minis, making it further more confusing.
You cant just point at other games and say “see it works there”. All games have diffrent circumstances so think abit further before believing u can just copy and get same outcome.
One of the biggest issues pvp has is keeping new players doing it, after being destroyed by skillgap/geargap. This change would like luis said ^ further complicate their experience.
And no, i hope and dont think this will happen, with no votes rapidly increasing, its almost 50/50%, an experiment that tinkers with something that already works shouldnt happen with 50/50 vote-ratio.