I am aware of the perks of having your /home not tied to your root filesystem. In my case, I have a single LUKS2 encrypted btrfs partition with separate subvolumes for root and home.

I just don’t see the reasoning for having it on a separate drive, as the OP explicitly states in their post. Both drives would have the same likelyhood of failing and it makes encryption (though, only slightly) harder.

What?

Why do you need /home to be on a separate drive?