TVs can not have depth like a window, where your eyes have to flex to change focal length to bring distant things into focus. Even “3D” movies and TV cannot do this.

It is potentially an issue for long-term eye health. If your eyes spend most of their time within a small range of focal distances, the muscles you use for focusing essentially fall out of shape. This can cause a person to need multi-focal glasses sooner than otherwise.

It also limits the mental health benefits of looking “out a window.” Your brains knows whether a scene is real or fake based on focal depth, regardless of resolution.