I only use it on the desktop and there I use it in the browser. They have a desktop app but it isn't very good.

Embedding pictures sounds like a nice idea, but I can't imagine how they could do it and have it look good. If I were them, I probably wouldn't add images.

I kind of hope they resist the urge to keep adding features to Workflowy. It feels done to me and I like simple, focused tools.