I could not give a flying fuck what it was rendered with , tech level is not impressive. But what a story and presentation. I find Flow beautiful. I, my daughter and my grandson watched it and could not take our eyes away from it.
Just as Flow's win looks even more impressive when you look at the films it competed against, who produced them, and what resources they had, Blender has been a project competing for parity and to be taken seriously while remaining totally free, and going up against systems that are either wildly expensive or not available outside the studio that made it at all.
Flow is not good because it was made with Blender, but Blender is proven to be very good and in that top echelon because Flow was made with it. For those who make or use Blender, this is big. Those folks have already believed for years/decades that Blender was great and serious, but now a lot more people outside that circle will know this, too.
My point was that the value of Flow is in its story, both written and visual and far overshadows any technical aspect. Avatar for example is totally opposite from that point of view in my opinion. Great graphics and absolutely meh, story.
I agree that what they have achieved for "only $3M" is nothing but amazing. I have no idea how much money was saved by using Blender.
It's pretty impressive to me that something of Flow's quality could be created with free software that's avilable to anyone with an internet connection. There are a lot of highly creative people out in the world without massive amounts of money for expensive hardware/software. It's exciting for the future of animation, and I hope all the news stories talking about Flow being made with Blender will inspire more people to give it a try and see what they can do with it.