Why do people keep repeating this? It makes me think that all the people defending the point are either working for Emby or are friends and family or something.
The point has nothing to do with how well it works in a browser. The point is the continual misdirection to make people think that there is a PS4 app... Just take a look at the top of this screen where it says Emby Apps --> Sony Playstation. Even the forum is set up to repeat the inaccuracy.
Hi. I do not work for Emby, nor do I know anyone on these forums personally. People repeat the use of tv.emby.media because it is all that is available right now for the Playstation 4.
While I do agree that there may be some misdirection, if you take the time to read the Emby Apps -> Sony Playstation page, it states quite blunty that you need to use tv.emby.media for Emby to work on your PS4.
Additionally, the reason for the lack of a proper Emby client for the Playstation is due to the fact that the PS Store is not open for many developers to use. It is not the Emby development team's fault that there is not an Emby client for the PS4, but Sony's for making it too difficult.
Also, as @Luke mentioned, you can use the full screen feature in the browser, and it works almost identically to a standard Emby Theater app.
More info can be found here: https://emby.media/emby-ps4.html