I have one favortie that loves to swallow the cum, but I love to see it shoot all over her face.

So, I pop the first couple of spurts on her face, then she takes my cock and swallows the rest.  

I then lick the remaining cum off her face and let her suck it out of my mouth.

She's happy, I'm happy.

But, I think your point has merit too.  

There are some gals who are not OK with CIM, but will do COF, and vice versa.