Why wouldn't you take the complexity and performance hit involved once at buildtime rather than offloading it to the client at runtime? If you read the origina

Why wouldn't you take the complexity and performance hit involved once at buildtime rather than offloading it to the client at runtime? If you read the original slides from the proposers, they're presenting a framing where there is an inherent tension between "serving the user" and "helping the developer". They argue that there is too much of the latter, and that a formalized splitting should push more to the former. From an end-user perspective, it definitely makes more sense that the js doesn't have to be transformed locally before it can interpreted. I think your suggestion is not compatible with the motivations of the proposal.