since the game is still in Early Access, I think it would make a lot of sense to lock each class' levelling up to their highest unlocked gun. since level resets/prestiging aren't available, whenever a new gun or future gadgets are added there's no satisfaction of levelling your class to unlock it if you've played that class enough. it'd give incentive to play more whenever a new weapon/gadget is added so you can try it out as well.