ymmv, things like employee at-will contracts are illegal in my area, technically unenforceable, and yet everyone still signs the form.

Fun times =3

YMMV = Your milage is controlled by law, and cannot vary.

You can sign broken contract freely - it's unenforceable, so you can sign whatever paper HR hands to you, and only when you're retaliated against do you need to care. Which coincidentally is when you stop needing to be cooperative anyways.

Don't "YMMV" your way out of laws that protect you.