If they would let us change the armor type I wouldn't mind it so much. The grinding process for armor really should be for the cool-down stats and buff stats.
I think it should be like a polarity thing if they won't let us change its element then make it to where we take increased damage of an incorrect mod being equipped, example if you put solar mod on void armor you take increased solar damage and void on void increases void resistance of course this should only apply to pve.
And give us a mods tab in collections that show us all the mods we can get so we can see what they do with out looking it up online or have the right armor and type to see it.