I failed to see why this would be something that "comes after Git" from a VCS perspective.

The line-based diff(1)/diff3(1)/patch(1) kit often works, and that mindset thrives and gets carried till today. Many toolkits and utilities have been designed to make it more ergonomic, and they are good. Jujutsu is an example. We also have different theories and implementations, some even more algebraically sound like Darcs and Pijul.

But GitHub the Platform is another story, given that they struggled to achieve 90% availability these days.