Nice feature, but not sure it would be 100% reliable. In my experience wireless rearly is.
I wouldn’t bet more than a ham sandwich on the functionality - but the WiFi on my 80d has proven to be a neat trick. I have used it to get images to my phone while on location (either for texts or Facebook). Also have sent images to a little photo printer. Nice way to show off.
The canon implementation of connectivity is, however, an abomination. It works - but barely. Hope it improves in the new cameras.
(Much more useful than dual card slots )