Is it still an Electron app? The only reason for using Electron is surely because you don't have the manpower to develop a proper native app. But then how have you got the manpower for a rewrite?!
Considering this took _two years_ it's kinda incredible they couldn't rewrite it natively in that amount of time or less. I'm guessing the only reason this took two years is due to the incremental approach they initially took.