FWIW a React lead said Inferno is how they would've designed React if they had to do it from scratch, and it's author joined Facebook to push React efforts forward.
Hehe. I think it's Open Source at play: X publishes an innovative method, Y iterates with a cleaner version benefiting from lessons-learnt, X says "awesome, let's join forces!" and they live together happily thereafter. Inferno passed over to another lead who's pushing it forward.
IMO this is a good outcome: there is some marginal value in yet another "React-like but faster" library, but the same energy could help a lot more people if applied directly to the source of the madness.
"Inferno 1.0 is really well written. It's how I would've rewritten React. I'd recommend reading its source to learn." - reading the source is much more effective than reading an article written by someone who read the source code.