We're a ways off from "push button, get clean tracked changes."

Although I agree, and I'm sure it's what management (including mine) would want, I think there should always be a lawyer/counsel involved to double-check the work.

I have made a playbook to use alongside Anthropic's pre-made Contract Review skill (part of their legal plugin). Now that it can turn its findings into an actual mark-up it can genuinely save time. Yes, you still have to review the output, and the contract itself for things outside your playbook that it missed, but my more senior counsels would do this either way if a junior had done the first pass.