Software features that can't be demonstrated by automated tests simply don't exist
It is one of the most useful and helpful things I have ever heard.
Knowing that you can't measure the user experience, you still have to create software that works. Whether the software works or doesn't work is independent of how it looks.
Good-looking software can do nothing.
Bad-looking software can totally solve a problem elegantly and effectively.
I mean, I can't demonstrate ... the screen pixel is correct in automated tests. So my features don't exist?
"my features don't exist" is taking the comment too far out of context.
You have two unrelated things.
One must be tested. If you can't test it, then it doesn't exist.
The other must be experienced. Note that you can make UI changes that users can't experience. They don't exist either.
The color-blind users, for example, can't tell that you fixed the "red" background to be a different "red". If you've chosen a color that a user cannot see, than the color does not exist.