This command is to manage revisions for the specific post.
I think that a large number of people need it for now... 😓

Examples:

Lists all revisions for post_id=221

$ wp post revisions 221 --format=json

Restores revision from 233.

$ wp post revisions 221 --restore=233

Displays diff.

$ wp post revisions 221 --diff=233:255

Or

$ wp post revisions 221 --diff=233