Perhaps in strikes, patrols, etc. But when you go into a raid we all have certain loadouts that we use. It's the same in pvp. Theoretically one could go in and do marginally well with any weapon if he/she has the skill. But when the competition heats up, we pretty much all know the choices get slimmer. At the end of the day burns were removed because they made nightfalls, the hardest piece of pve aside from raids, a cakewalk.