I think homeassistant’s approach to automations design might be an interesting inspiration. They offer a very similar block based approach to fibery (with a lot more blocks to control the logic) but also a diagrammatic way of visualizing the flow.
homeassistant also excels in giving you access to the underlying “code” in almost all areas, including automations, usually in the form of yaml which makes defining, duplicating and tweaking automations a lot easier for the more technical users. I often find myself building the basic flow visually and then switching to yaml to fine-tune everything.
I know this is yet another departure from this topic, but thought I mention it.