I'm kinda torn, I think the best thing to do is add burns to all primaries. If you just add burns to a certain group maybe it does cause an imbalance. Idk tho. I miss the burn primaries but I also like that a gun from the vendor for instance could be your favorite gun, where before you pretty much had to have a burn raid weapon.
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Not to mention, they did this to allow exotic primaries to be used in PvE. Year 1 Players remember complaining that there was no point in using an exotic primary.