I love the passion and fun they were having while talking about the company, business, marketplace incentives, Ruby on Rails and mechanical keyboards! It was fun watching them have fun.
I believe Sorbet is from Stripe?
On second thought, It is a large investment for something that isn't a core Ruby feature.
Since then I feel like most people just opt for go/node instead in my experience. Better performance and easier to deploy and scale.
But you should correlate what the talk of the town is with how much something is being used, it is still heavily used and a good option for startups.