The benefit is that the dishwasher can be labeled as "smart", be more expensive and can track your activity through the app. Oh, and don't forget about more points of failure and security issues!

Sorry for being bitter, I'm in the process of a kitchen upgrade and find I'm frustrated by the options I have

The dishwasher came with the house, I didn't choose it, but I searched it up at the time. Apparently some people will put in the detergent in the morning, and everyone loads their dishes in all day, then you can start it from bed at night so it's clean in the morning.

Apparently another benefit of WiFi connectivity is that you can get a notification when it's done.

Personally I've never connected it as the benefits don't seem to outweigh the spying.