I didn't mean it as a problem on the technical side. More on a PVP balance side. Not exactly fair on the xbox side if the PS guys are running around with exclusive weapons. Especially if they are good. Cries of unfair advantage can be heard just thinking about it.
This is a weak reason because players already don't have access to every weapon like they did in Halo, so there is always this inherent inequality among players regarding weapons and gear.
Bungie and Activision are going to have to sell Microsoft and Sony on cross-platform implementation. What about leaning into this with a Pokémon-style split? Destiny fans will need both consoles to collect the console-specific rewards from each version, and have to play from that console to use those rewards, ere go:
"Yo, lemme switch to Xbox so I can use At the Gates."
"I'm on my Playstation because I'm trying to get a Blue Blazer"
The pitch would be: "Hey, if we implement these systems in our game, our players on your competitor's console will have in-game incentives to buy your console."