To some, the bigger picture of what could be possible includes using multiple languages, multiple build steps, etc.

Refining individual ecosystems to be effortless to use is one thing, and it’s a goal worth pursuing for the benefit of those who are happy in that ecosystem. For those who rely on bringing different technologies together, though, there can be a lot of complexity and nuance.

The point of these projects is to take that complexity and nuance and provide an effective “super ecosystem” to piece them together in. That’s why some of the biggest proponents of these technologies are Google and Meta - they have many interacting parts in many different languages that need to come together and work effectively.