Just wanted to let people know that Supermodel is running really nicely on MacOS Sierra (10.12). So much so, there even seems to be a bit of a performance boost from all the optimisations Apple must of done. Great!
So basically, don't worry about Supermodel messing up as it works great - in my case, even better as games that were laggy before seemed to of mostly smoothed out.
(This is of course using the new 3D engine, as the one still doesn't work)