This is so idiotic. You do have a mind of your own don't you? Just do what most of us do, play the game for what it is and ignore the leveling up systems.
First problem I encountered was that I wanted to play the game with the weapons and their loadouts which were actually used during the battle of Stalingrad and to make that possible you have to grind kills and xp for an insane amount of time before you will be able to do just that.
Second problem is that weapon unlocks are locked meaning that some weapons turns out either for the worse or into rare experimental weapons with very long reload time which makes the use of those weapons unattractive or just plain silly.
You can not disregard the effect the need to grind weapon unlocks does to the players mindset and as I am competetively minded player the sense of actually achieving something was greatly diminished after unlocking lvl 50 MG34 and PPSh41. Simply winning a map just doesn't cut it anymore when the game tells the player that the objective of the game is not winning maps and team play but instead grinding kills and xp so the player can achieve herodom and all lvl 50 weapons.
I loved RO for its purity of gameplay where the only thing the player had to concentrate or worry about was to be a good teamplayer so the team could win - in RO2 the player also has to concentrate on gaining enough kills as well as xp in order to grind unlocks and levels and while xp and team work goes hand in hand team work becomes, not the result of a deliberate action or thought but rather is a result of random selfish actions that just happens to coincide in a way that helps the team as a whole.
That sense of achievement was far more profound in that game than it is in RO2.
The game's player character mechanics tells clearly what RO2 is about: Levelling up and weapon unlocks, team play is only a tertiary goal or part of the game at best - coincidental at worst.
Good for you that you can still play the game like you use to play RO - I just can't.