Games with bots should not give progression

Why not just let people play how they want to play? If you want to progress in multiplayer matches against players only, go hard. But some people just want to chill and use cool **bleep**. I don't want to stress about getting 200 headshot kills with snipers against other players. I suck with them and don't really enjoy using them. But I do want to unlock everything. I like the fact I can just jump in and far bots for a while.