Then why did you wrote
> it is not possible to make it part of a software RAID device
You are saying it is both not possible and that you've done it.
It requires manual intervention of a knowledgable person to boot a UEFI system into the default OS if the ESP is broken or missing.
It requires manual intervention of a knowledgable person to boot a UEFI system into the default OS if the ESP is broken or missing.