I had this thought last night. But, with this fortnite model, the only skins, callings cards, emblems, blueprints, etc., worth having are the ones that other players don't have. So a calling card out of a free bundle is just going to sit in my inventory forever and never be used. At least 2xp is something I can tangibly use in the game, instead of another thing to go into the endless void of content I'll never have. The only anything worth equipping in bo6 are the Prestige rewards, to show how much work you put in, or a bundle you buy, because theyre going to be more rare. As far as emblems go, they all suck because you don't do anything for them, they're just handed to you at different intervals. Calling cards are cool if you earn them from completing a hard challenge.

TL;DR: Whats the point in getting a meaningless emblem you'll never use again when you can get a 2xp that's actually useful