Nobody gets forced any more than anyone else. At present the PPU has the only antibuff. It gives people the option to be able to remove/weaken shields or just go for pounding them to break them.

As for making it effective - well it does what it says on the tin. Effective against anyone with a shield on them. You make the choice. Do you opt to do damage or do you opt to remove the shield. Just the same as all other team based combat. If your fight is 1v1 and that guy is shielded do you run the risk of removing a shield or breaking it with firepower? If it is in a team does one guy go for the removal and the others get ready to pound the unbuffed target.

How is the mechanic any different to bringing a ppu with antibuff?