The answer to your question of "why not Electron" at the end is: because then your app will suck. You've laid out the reasons why native apps are harder to make, but the reality is that Electron trades your ease of development for the user having a crappy experience. If you care about producing a good product, then you have to suck it up and make the native app even if it is harder.

Also, I think C# is miles better than TypeScript, but that's just my preference.