Earlier quoted context omitted.
What happens in two or three years when they decide to stop updating the app and it no longer works on your phone? They couldn’t bother since there was no recurring revenue stream so you just have to buy a new dishwasher?
I believe the other person was talking about having the devices serve up webpage UIs, so you wouldn't need their specific app, just a browser. A lot of makers do this with their 3D printers and CNC machines, as it avoids the cost and hassle of installing a display on the machine. Two of the more popular ones, for those interested: octoprint.org cnc.js.org
Personally I don’t like those either. I’ve experienced it with printers (which can only be configured initially via USB and some app), 3D printers (configured by putting an SD card in your computer), and other gizmos. They’re all a pain to deal with, especially if your WiFi details change or their IP does.
Some others expect you to connect to THEIR Wi-Fi network instead. Which is also a complete pain.
I don’t mind having an app to make the device more useful, but it needs to have enough controls on the front to use the thing and preferably reconfigure the Wi-Fi if necessary.