Add Preview in Compositior & Shade Editor Like Video sequencer

Hi everyone, sorry for the quality of the images.

I propose adding a preview to the compositor and the shader editor. Why, if we can use the backdrop or the 3D window?

Because using the backdrop isn't convenient for me; the nodes can be distracting because they're above the image. I'm not saying to remove this background option, just that a new option could be added to view it. And in the shader editor, having the preview option could be easier than opening the 3D window, creating the mesh, and configuring the rendering engine, etc. It might not be that difficult, but it's just an idea. Anyway, what do you think? What drawbacks could it cause or advantages could it have?