I'm the author of C2, and you're exactly right. React provides everything that C2's underlying DOM manipulation library (https://github.com/lynaghk/singult/) does. React is faster, capable with more browsers, and has better API hooks that let callers control the low-level details.
Thanks for C2!
I've just looked and it is indeed indicated as "Deprecated" in github, but in keminglabs.com it still states "C2 is a very early project, and there’s a lot left to do." Perhaps that could be updated... I remember some time ago I wondered this, and I didn't see the "Deprecated" in github, if it already was.
Oh nice, and thanks for C2. Really all I had to do was write my own scaling fn and just move the state into a Reagent atom and it all worked the same as before.