I work for city government and we need to make a lot of public-facing web maps. The symbology options in ArcGIS Online are so limited compared to ArcGIS Pro. For me, the major omissions are the lack of "layers" for line symbology so you can create line borders and more complex dashed lines, and no hatched or pattern fill on polygons. The "gallery" option in Pro provides so many good templates for lines, but none of them are available in ArcGIS Online, from what I understand. I've tried to create custom line symbology by creating multiple copies of layers to create layered symbology, but then ArcGIS Online does not allow you to exclude items from the legend, so the legend gets garbled with all the copies.
Can ESRI prioritize improving this functionality?