I just spent time working on a flow, and then it failed to save because of an outage on your end in terms of the connectors. Meaning the only option I have to preserve my work is to keep the tab open and hope windows update doesn't restart my computer and that my browser doesn't crash. Otherwise I have to start from scratch.
As long as the flow isn't set to enabled, there's literally no reason to not allow us to save. It's anti-user design.