No idea who decided on the colour core/ armor core system but they need to be fired.
No amount of “Market and User research” will ever come to the conclusion of “Let’s rob players of their ability to customize”
It’s not even a monetary benefit. People will straight up just stick with their favourites and never buy anything else ever cos they don’t get to mix and match, hurting your sales revenue even harder.
Example, if someone loves rocking Emile’s EVA helmet, but find out they can only use it on Mk5B Core, their incentive to explore other Cores already took a huge hit.