350 hours of playtime - 1 weapon at 50

So, I started playing with a lot of different weapons to try them out and have fun. My first goal was to unlock at least a silencer for every gun (anyone, not even the best ones). My next goal is to grind every weapon to level 50 for the last camo. I have over 350 hours of playtime now. I have at least one silencer for every weapon, and one weapon at level 50.

In my opinion, the grind for the attachments for the weapons is way too excessive. Why not unlock the attachments of each weapon in the first 20 levels, and after that you get the camos?

To get every wapon to level 40 to have every attachment is just... mad.