The non-iPhone users don't send the blue text. Your sent texts are blue on your iPhone if you're messaging another iPhone user and it's green if not.
Though, who actually cares about this and why?
Anyway, I recently switched to iOS for an experiment and my biggest gripe is: no back button. Instead of a conveniently placed button, I have to always reach up to the upper left corner of the app to go back.
My second biggest gripe is that links from Apple's shitty programs only want to open in Safari instead of my browser.
And third, I can't organize my icons the way I want to. Typical Apple: No choices. Their way or the highway. Fuck you power-users and people who know what they want.