I think this is the key point -- JavaScript is eating the world because it allows a single team to support a single codebase built in a single technology across

I think this is the key point -- JavaScript is eating the world because it allows a single team to support a single codebase built in a single technology across all target platforms with minimal platform-specific integration. Indie software gets to exist _at all_, and businesses don't have to pick and choose which OSes are worth the investment, and which simply won't get the product. As was common 10-15 years ago, when most software was either Windows or Mac, often not both, and Linux considered itself lucky that Flash was only a _little_ behind instead of a _lot_ behind.