What’s your use case, if you don’t mind me asking?
By the sounds of it, cooking....
Well, if so, then the M1 presents even bigger problems given its heat management.
That's a fair question, but I don't want to answer it. It's a little like asking 'what's your use-case for scissors?' in that it would take a couple days of prolonged reflection to answer comprehensively. Whatever I come up with in twenty minutes won't be the half of it. The effect of appending use-cases later, even if they are important ones, will be to make them sound as though they aren't (ie: 'if that's important why didn't they think of it immediately?').
They can boot from external drives, it's just that it's a bit buggy right now.