Comment by XorNot

That actually is exactly how it works today with ESPHome flashed to the Tuya related chips. It's also the only way to do OTA: download into second partition, switch boot.

But more widely: you just don't need to flash devices very often.

Moreover OTA is just because that's something we used to be able to do till Tuya shutdown the cloud cutter hack which could do it (which also requires physical access - you have to reboot the device into flashing mode, you can still do it but you can't custom flash anymore OTA on most newer ones).