Interesting. I applaud the efforts ... though I do find myself wondering if that energy could have been focused on a more unified front for those compatibility layers instead. Backwards compatibility certainly would be useful but I feel like modern compatibility (parity) is a sisyphian task. You'd be eternally chasing a standard that a company is setting for you. The exact company with a history of file format and code changes to fuck with efforts identical to this. You'd never be able to pull ahead.
I'll have to go read up on the project. I'm interested in the project itself - but deeply curious if they have addressed that elephant.