To be fair if legal paperwork follows a standard process with standard information, a "robot" can complete many orders of magnitude more than any human lawyer. (I'm also not a lawyer and have no idea if this line of thinking is applicable.)
For basic stuff this is 95% of the end product
I expect the benefits of increased efficiency will be seen as temporarily zeroed inflation for legal services (prices actually going down? LOL) and a bunch of rents, forever (more or less, from the perspective of a human lifetime) to whichever one or two companies monopolize the relevant feature sets (see also: the situation with digital access to legal documents). Lawyers will be more productive but I expect comp will stay about the same.
And I think that as someone fairly pessimistic about the whole AI thing.