Why should they, they are like massive tanks everyone loves! Besides, they are mobile dispensers, you need them on the battlefield.Carts can't hide in dark corners on top of crates, nor can they dodge bullets.

This helps team RED. I don't think a cart has to go multiple routes. Again, it adds chokepoints that are needed sometimes. Just look at Dustbowl, you'd get rolled everytime unless there would not be any turtle points for RED.Carts have to follow tracks. Presidents can go wherever they wish.
And that is a bad thing?You cannot feint with a cart. You always slog through the corpses of your enemy.

Point taken.Carts cannot beat people to death with an umbrella.