I think my biggest question is who cares? What does having an interesting internal architecture have to do with the “its electron though” ideological attack.
It is made to perform much better than your typical electron app would. Saying electron-based == shitty is complete misunderstanding of the technology. Although i dislike Figma as much as the next guy, their app was in many ways very impressive. See Figma's cofounder old articles at https://madebyevan.com/figma/