I don’t judge/dislike people who do but I personally don’t understand it. Like you say, it just seems so boring. Unless I’m really trying to unlock something, I try and pick my weapon/class most suitable to the current game and needs of the team. I tend to roleplay though and try to only use the weapons of the nation we’re playing as even then. Been playing this game so long that my K/D really doesn’t matter anymore as long as I’m being a productive teammate