Can I delete all cameras in a scene with only canvas

Just a quick question: I deleted all cameras in my menu scene that only has a UI canvas.
The canvas shows a background and a button that moves the game to scene 2.
It’s working fine! But Unity warns me that there is nothing being rendered because there is no camera.
Does it have any ill effects to remove all cameras? Is it recommended or is it a bad idea?

I do that and never had a problem. The main menu is an overlay canvas so I removed the camera and light from that scene.