I suspect that part of the problem is that they got VC money to do the rewrite in rust, and it took very long and the results aren't as amazing as expected.
But that's just my own conspiracy. I have no idea. Perhaps things changed since I last ran the benchmarks.
Benchmarking isn't easy. I know that my software using my library mostly loads Unions, so that's a focus in my benchmarks. However I have absolutely no idea of what the other users are doing with it, and my benchmarks might not be relevant to them.
In the end I wrote them for myself mostly, to check for possible regressions in performances.
