That's all well and good, but there are nontrivial costs to creating a system where you need to have a lawyer vet every line of every contract you sign.

There's been a general consensus about what a "market" employee agreement contains, which lets people make decisions in a relatively uniform way between offers. If it becomes known that any company associated with a certain firm has wacko contracts and that you'll need to pay 20k in legal time to even evaluate their offer compared to others, it becomes an easy no all around.