why NGUI not use Unity3d's Coroutine in tweener to control times...

[FrankYan]

May be a stupid question,But I don't know the reason why NGUI isn't use Unity's Coroutine to do something like make delay call?

I find that topic that "Using the function WaitForSeconds doesn't seem to produce exact results".
http://answers.unity3d.com/questions/203426/how-to-get-precise-timer.html

[ArenMook]

You'll need to elaborate which use case you're talking about. Where would you use a coroutine and instead of what?