Well, yes that's just it.
The Standard View and the display view is only a maximize button and not a fullscreen option. The maximize option is ok on a Windows based computer where the default layout is one desktop, but for a OS like macOS that is optimized for quick flows with separate fullscreens, then the need to make a separate desktop to run a maximized version of an app feels like running an app from 2010, and it breaks the "flow". Also when playing a video in "fullscreen" mode in display view this locks up the whole desktop, so why not provide the modern way of mac fullscreen? It would be so much better!
Now I have to open the app, create a new desktop, move the app over to that desktop an maximize it. And if I hit the topline it goes back into windowed mode and need to be maximized again. You also loose screen realestate because of the topbar that is always presented in maximized view.
Theater View is fine on a media center computer, but for running on the desktop/laptop it is also not good. And when I tried that now and stopped playing a video the whole view did not respond. Only showed the theater view with the buttons, but could not press on anything. Also going to mission control all the other windows for MC was gray and I had to terminate the app.