In the general case I think you underestimate how performant JavaScript JITs are these days. For 99.9% of use cases the performance is enough.
Sure, for embedded it might not be workable, but again- since we're discussing killer features I think we need to think bigger. Embedded is far too small a niche to be considered to be Nim's killer feature, especially when this space is already dominated by Rust which supports WASM very well (and therefore hits the performance + uniformity you desire).
Sure, for embedded it might not be workable, but again- since we're discussing killer features I think we need to think bigger. Embedded is far too small a niche to be considered to be Nim's killer feature, especially when this space is already dominated by Rust which supports WASM very well (and therefore hits the performance + uniformity you desire).