How ergonomic are the modern AVIF encoders? I like libjxl (and cjpegli) because they are really good at generating reasonably compact, high-quality images.

For every other image encoder I used I couldn't find one setting that would make compact, high-quality images across the gamut of inputs (e.g. things like comics that have extremely visible high-frequency content would look terrible at quality settings that looked good for many photographs).

Have you tried the latest AVIF encoder? It's quality setting seems much more stable.