Could you elaborate please? What aspects are you referring to? Biometrics for pam? Facial recognition support? Genuinely curious, since I saw the bounty to streamline keepass and pam auth for instance, or howdy for biometrics. Looking forward to both but do you have more information?

I found that for my use case (jellyfin, gitea, portainer, nextcloud, adguard, ...) the pis are still nearly idle but the bottleneck for me was ram. Anyone with similar experience?

I feel you. I don't know your usecase for photoprism, but do you know immich? https://immich.app