It will be interesting to have a desktop client to design flows for sharepoint. (At the moment I have used only for sharepoint and I don't know if it will be usefull also for other kind of connection.
You connect the sharepoint site and you can design on the tool that allow to have more space in the window to follow branches and write expressions.
On the web often I lost what I'm writing if I need to check other part of flow..
Thanks in advance