Is getting to the end of a file not a visual confirmation as well?
Absolutely, that's the point my post was making. When walking to the end of the earth, there doesn't need to be any sign warning about coming to the end of the earth, it just ends! (Assuming of course, that the world is flat. )
I never put the ?> at the end of my PHP-only files to avoid whitespace from showing up before my HTML. And I do not put anything at the end of the file to tell me it is the end of the file, because that would be stupid.