Every one knows what "u" meansImagine for a moment you're posting on an international forum, where for many of the posters, English is not a first language.
Oh, wait! You don't have to imagine - you are posting on such a forum.
The name of the letter "u", for instance, may not in some languages match the sound of the letter.
Like English, for example.
The "u" in "much" doesn't sound anything like "you", does it?
So, you're alienating some of your audience.
Anyway, I'll say no more on the subject (another different sound for "u") and leave you to your pointer studies.