I've been using Illustrator for many years now. And it seems that I've been having this issue off and on for just as long - jagged edges in JPGs and PNGs on export. The issue seems more pronounced in Illustrator 2020.
Is there some kind of special approach to exporting smooth raster work that I'm missing? (I'm talking going from 100% vector to jpg and png exports.) I always make sure to have anti-aliasing on for export. I've tried both Art Supersampling and Type options for that. I make sure the document is at high resolutions. In addition to that I've even enlarged the artwork itself inside an already high resolution document. All this effort minimizes the jagged edges but fails to eliminate them. And to make sure it's not just my imagination, I've imported the vector work into Photoshop and exported as JPGs and PNGs from there (with same pixel dimensions), and I get smooth-edged exports that way. So something seems to be an issue with Illustrator, OR there's some vital technique I'm missing.