Raid gear is for pve.... even more specifically, the current raid gear is only effective in vault of glass, and level 30..... also, level 30 means nothing in the crucible, where as iron banner is built for the elites to clash in. Noobs get bum -blam!-ed in iron banner... and there is armor for crucible, everything from whites, to exotics... raid gear specifically takes down raid monsters faster, it wasn't intended to be the only way to level 30, seeing as level 30 isn't the max light level they intend to stop at. Its still in beta in my eyes, and with another vault of glass opening up, they will find a way to allow players to steadily increase their skills and their levels.