Yea, it definitely seems geared towards ordinary users rather than admins. On the other hand, he did say it would remain backwards compatible with the existing

Yea, it definitely seems geared towards ordinary users rather than admins. On the other hand, he did say it would remain backwards compatible with the existing system of preassigned uids and ordinary home directories, so that's ok. You could use a migratable home directory for your development machine while using ordinary home directories on servers and VMs. Also, you can rekey a LUKS volume very quickly. Each volume is encrypted with a master key which is encrypted in turn by your personal key. Rekeying the volume just means decrypting the master key with your current key, and reencrypting it with a new one. Similarly, you can have multiple keys that can decrypt the master key. On the other hand, it's something you will only do rarely, so you'll have to look it up. I don't think I'd get a lot out of it personally (last time I migrated to a new computer I just moved the physical drive), but it won't get in the way either.