Why hasn't Slack built a P2P fallback for Enterprise teams? Slack server knows at least which clients has recently been active in a chatroom, so the server cou

Why hasn't Slack built a P2P fallback for Enterprise teams? Slack server knows at least which clients has recently been active in a chatroom, so the server could send that information to clients (per privacy opt-in) who can then make a best-effort attempt to send their new messages to the recently-active clients. Perhaps that's just self-hosting with extra steps. At some point, isn't it cost-effective to offer customers a SaaSBox that they can deploy as a minimal-functionality on-prem backup to the cloud service?