I've watched that guy's video. The Apple arm64 Macbook Pro doesn't even charge without a functional SSD. I suspect it also doesn't boot off anything else if its main SSD is dead.

Was that an Intel iMac? On the Apple Silicon machines, the internal SSD also contains all the stuff that would be on the firmware flash chip and NVRAM on an Intel machine, so it's required even when you boot from an external drive

No that’s not a solution for that. I meant it if you need more space down the road.

You can boot Macs from external drives.

Yes, you can. Can you boot them from external drives when their internal SSD is dead? This isn't about booting them when their OS is wiped out.

Having a dead SSD seems to kill these computers. That's expected for something with soldered flash chips.

I’ve owned Macs for decades and never had an internal drive die, SSD or not. And I’ve worked in the HPC storage industry for years. My expert opinion is that you’re making up reasons why this is bad.