>What makes Vue "insanely" more productive than React ?
React is a fantastic rendering library but there are no great React frameworks. Next is ok, but it's a beast that most people don't need. The beauty of something like Vue is having your batteries included in a standardized way that you don't have to worry about when upgrading, while also still being fairly lightweight. The average React app becomes a hodgepodge of dependencies that get frozen in time due to the fragile nature of NPM. Versus having a known and documented upgrade path for your router, state, styling, etc.
Vue is a unified ecosystem of tools written by the same authors and designed to work with one another. React gives you way more rope to hang yourself. Good luck figuring out what the routing and state management flavor of the minute is.