Not here to dissuade you, and it's good to see another argument in favor for the OP's idea. Just a few points, though. Stamina and ammo management are only similar up to a point. Stamina wasn't only removed for tedious management, but because an entirely upgraded/new system was in the works, and coptering had to go due to forcing everyone to equip certain weapons for mobility over actual preference. Stamina and Parkour 2.0 feel closer to Universal Vacuum: there was no better way t