afaik you are not the customer for customer support, and in the vast majority of cases human phone support is setup for the opposite case where people just want to be walked through something they can't find in the UI.

So this isn't as much of a financial engineering cost cutting move as it feels like to the type of person who truly calls because the require a human. It truly provides better service to the majority of people because they get their answer faster and more efficiently.

This is also demonstrated in the pricing of these systems at a per "open cases resolved"- they're putting their money where their mouth is.

Of course I'm also personally in the group where I call because I can already read a support page and I really need a human.... It could conceivably put true human support into another tier higher of perceived value.