Generally, you would call this type of setup (no OSD, no local control) a "headless system".
There are certainly advantages to this setup, but it also comes with its own set of disadvantages! Your Wi-Fi better be rock-solid and you better have little interference, etc. Also, you always MUST have a device to connect to the interface, and batteries in your device that need charging are the biggest headache here.
I currently have a headless music streamer in the form of a Raspberry Pi. It is great! I can connect to it with any device that has Wi-Fi access and a browser.
But, then I get into a situation where I forgot to bring my phone or laptop upstairs where the streamer resides, so I have to go back downstairs to get some device to control my music streaming. On the other hand, if I'm downstairs and want to kill my music upstairs, I can quickly do that from any device.
With all of that being said.....one of my next projects will be to install a touch-screen for local control. The bottom line is that Wi-Fi access and control is great, but I personally would not recommend a complete lack of local control--It will eventually become a hassle!
EDIT: I suppose that the target market would likely just pay the $ to have a dedicated device that is always powered up to control this setup. Likely, same goes for the Wi-Fi, the target market would have enough $ to make a call and say "get it done". For the other 99% of us, my comments above still carry weight. I have not seen much info on this forum for anyone else that has any experience with a headless unit.