If I have my Warhammer level 20 and I played Warhammer for 100hrs and my Axe level 20 and I played Axe for 40 hours we could have a bonus expertise for the weapon we used more.
2% more dmg.
If we dedicated more time for a specific weapons we should get rewarded for it.
After we reach level 20 with all weapons we don’t have nothing more to level up.
But I could go and play more 61 hours with the Axe to turn it in the my number one weapon with the dmg bonus.