They do exist already, just not as widespread as I imagine the author is hoping to see. I work for one of the only software vendors in the space. One place wher

They do exist already, just not as widespread as I imagine the author is hoping to see. I work for one of the only software vendors in the space. One place where I've seen an expert system excel greatly is in automated billing resolution. Legal bills are often handled by third parties who maintain the billing contracts between a law firm and it's hiring party (who are often just other lawyers). What can and can't be billed for is usually determined by an exhaustive set of rules defined in the contract, and invoices are usually fed into a variety of out-of-date web forms. The task isn't cut-and-dry enough to automate via ML, other than small NLP tasks, so the system relies on a long list of hard-coded conditions managed by a swarm of bots that fail quickly and loudly to call out entry errors. It sounds messy, but it works very well, and the errors aren't muddied by a black box.