Bosses will have recalibrating shields, in the Prison of Elders, for a different damage modifiers (arc, solar, void), we need a weapon wheel or a hotkey assignment for various weapon load outs, so we aren't bogged down with the character gear loading screen, while being picked off by adds. Games 15 years ago had weapon wheels, and the emotes (dance, point, wave, sit) are useless.
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They won't do it because it would essentially allow you to play with many more weapons at once (since switch would be so fast it's like nothing) You will have to have a loadout with every burn...or have each teammate select a specific burn and coordinate