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can you tell us more about what you mean by 'self destructing while not being plugged' ?

If you simply unplug a RPi without shutting it down properly there is a chance that the SD card will get corrupted. It is possible to 'harden' the system by mounting the SD card read only, but that is a faff to set up and I've still had corrupted cards. This makes the RPi not useful for kiosk type applications.

Contrast with Arduino, where I plug it into my laptop and upload some code, thereafter I can plug it in/out/'turn it all about' with power and it reliably does 'stuff'

Apparently the CM4 comes with on-board eMMC as an option. About time!

Have you considered any of the raspberry pi power button options that exist? Something with a reasonable size capacitor and a signal pin to let the Pi know to shutdown when it's lost power, before the capacitor runs out, might work?

Yes capacitor power button would work (assuming it is reliable). Still an amount of faff and expense to set up, especially if you are scaling a deployment. It would be great if the RPi (or some version of it) had this 'pre-installed'.

not OC, but I guess linux not booting, because the file system got corrupted.

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