"\frac{4}{5}" is exactly what I wouldn't like to have.
Is exactly what I would like to have, of course.
I really don't see how this is more horrible than "\frac{4}{5}". In fact, it's fewer keystrokes.
"\frac{4}{5}" is exactly what I wouldn't like to have. "4/5" is not - because I do not know what will become of it. Simple example: I do know exactly what will become of "\frac{4}{\frac{10}{2}}", but not what will become of "4/10/2".
It's as simple as this: I want to type what I mean, and I want what I see on the screen to reflect what I mean.
You're contradicting yourself! You type "\frac{4}{5}" and expect NOT to see what you just typed on the screen, right?
Well... did you really understand the line you replied to? Hint: reflect is the word you are looking for...
"This isn't brain surgery; it's just television." - David Letterman