Respectfully, losing a single potential user is not indicative of "bad decisionmaking". It may very well have been an excellent decision, particularly if using Electron allowed them to support macOS and Windows out the door - thereby expanding their target audience significantly.
I get why you don't like Electron apps. I share your position in that. I would expect that if Ivelope grows quickly enough to justify it, time will be spent on improving resource utilization. That could be through scrapping Electron or through optimizing within it - but either way, at this stage "time to market" and "speed of iteration" are much more important than resource utilization.
