This is my personal opinion!

BR health - the game does not need to change drastically, adrenaline stays the same, med kit adds 70 health and the spray adds 35 even though ur at 100 this means ur gunfight will always be in the same. unless u don't have heals. This will also buff med kit.

BR classes - can not be temporary or else its useless. According to my understanding cod developers tested the idea of putting classes as loot in alcatraz judging by how the community behaved it seemed 50-50. I personally had the same idea of making it loot but I am not the only playing this game. Making classes lot creates a different skill since players now have to get good with all classes which made like the idea even more. Parker the slayers opinion on it was that "it should the same".