As it stands now, from my understanding, the failure case of the proprietary solution is the same level of security as the best case of the open source solution. So I don't see your point. Open source isn't any better.
Open source full disk encryption can be password cracked without limitations just like a hacked T2 chip. A sleeping open source full disk encryption machine can be accessed with enough skill to pull things out of frozen ram, etc.
Open source full disk encryption can be password cracked without limitations just like a hacked T2 chip. A sleeping open source full disk encryption machine can be accessed with enough skill to pull things out of frozen ram, etc.