Once again- why would you want to add each contact separately when you could quite easily multi-select them in one swoop?
Why did Apple add copy and paste when you could just retype the text?
Why did Apple add multi-delete/forwarding functions for SMS/email?
Why did Apple allow you to select multiple recipients at all when you could just retype the message?
Answer: because it's intuitive and makes life easier for the user, if only a little bit.
no, its not intuitive. i think the method i mentioned is easier. this way you dont have to scroll through contacts. you can just type 3 letters of the people you want to send it to. the three things you just mentioned have nothing to do with what you are saying and your point is moot