It’s not only that. The progression system was f-ed, requiring you to switch from your favourite weapons to other, shittier ones just to get an achievement. Some weapons had barely any, some had a lot, so you could end up getting the progress from your favourite weapon in a match and had to switch to grind a pistol or some stupid shi like that. The devs defended this system forever, but finally gave up once the numbers were at the level seen in the screenshot.