The armor core restricts customization for no reason.
For example :
I use the classic EVA helmet, which is on the untra rare core. However from the store I had bought the pink visor, which is also untra rare, just to find out I couldn’t use it.
I am fine with the idea of legendary armor cores no being customizable.
Instead of restricting customization, I propose we can use any armor pieces together.
Along aide still keeping different cores but instead of the current system, the multiple cores allows us to have different custom armor sets, that we can swap in and out, or choose to use a random core in matchmaking.