When you upgrade everything in the progression screen. The XP become useless. I think they should add XP leaderboard to show XP with your friend. That would be fun. Because there's infinity delivery mission that you can gain infinity XP. But you can't do anything with XP :V Or they should make XP rank system too!
Like 10,000 XP = level 1. It would be better if they do this :P
I am the combat master :V
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for the none social players like me, maybe have something to unlock like run faster, or your punches do more damage for an entire main mission. when you maybe reach 10k xp, you can play all main mission without dying.
just something that came out of the top of my head.