> We can now hopefully wait for better encoder.

Or even better, participate in improving it. The reference encoder is, I believe, in the libjxl repository[1].

Much of the recent effort seems to be focused on the performance of the Rust version of the decoding library[2], which is quite understandable because of the fresh browser adoption.

[1] https://github.com/libjxl/libjxl

[2] https://jxl-rs-perf.lucaversari.it/?config=desktop%7Csingle&...