Consider the domains
What could be the problems with adding number as in the second example?
I can think about the following, I speak Hebrew and in Hebrew I could say:
star one dot com סטאר וואן דוט קום
I could also say:
star ehad dot com סטאר אחד דוט קום
(ehad in Hebrew means one).
Either of the Hebrew phrases might confuse a listener (vocally); the listener might not be sure if either "one" or "ehad" would mean an actual number 1.