When were doing whiteboard session an talking about shape, icons and so on, getting everyone on board by pulling in an icon from the HUGE library really really helps speed things along. Doesnt have to be pretty designer icons. Pictogram works fine. Its just to get an idea of everyones thoughts. That would make us switch to FigJam from Mural.
You can always add your own libraries from Figma into FigJam. This also means you could utilize icon libraries that are available in the community. Just download them, add them to your libraries and then within FigJam click the libraries icon and then the plus icon to add a new library. Hope this helps. 
PS moving this into Questions, since this functionality exists.