No, definitely not IMHO. Twice the support, new frustrations when something you need suddenly is not in the micro version.
And to what end? To shave miliseconds off a page load time in theoretical scenarios? To save 2 mins in installation time?
I genuinely see no reason whatsoever, unless CI ends up bloated and slow like other frameworks, which I am sure it will not.
Perhaps the sites I build are not big enough to have a valid opinion, but speed has never been an issue with CI for me.
Paul.