Did Adobe finally fix Illustrator’s notoriously bad anti-aliasing, or is it still garbage for pixel perfect work? I wouldn’t put it past them to introduce the asset export feature without fixing it.
I'm afraid they haven't. It's a technical limitation. AI (and Adobe XD) use supersampling for AA on GPUs with only 4 levels.
The header navigation scroll behaviour is highly annoying.
Asset Export is a useful addition for iOS design, but it's practically useless for exporting to Android, since it saves all the files in the same folder, and differentiates the dpi via filename suffix. Android projects have their resources organised in folders for each dpi, and the files for each asset should all have the same name.