I'm not sure I understand your criticism - in what way is it not a port to pure webassembly? I'm tempted to hazard a guess that you expected a rewrite, but that

I'm not sure I understand your criticism - in what way is it not a port to pure webassembly? I'm tempted to hazard a guess that you expected a rewrite, but that's not what port normally means - if I said I ported ffmpeg to RISC-V no one would have expected me to have rewritten all of ffmpeg in RISC-V assembly, they would expect that I did mild-to-medium modifications on the source and build system to get it compiling to RISC-V machine code (which is analogous to the ffmpeg.wasm project). If that's not what you meant, I apologize for interpreting incorrectly!