“Nobody” like in “SONOS literally bricking its old devices and telling you to buy a new one”? https://www.whathifi.com/news/sonos-explains-why-recycle-mode-bricks-old-speakers

Ha, good catch! Behind the scences, git is actually using your private key to sign the commit. You’re only specifying the ssh key git should ask ssh-agent about. You can also specify the private key and actually need to when not using an agent and the key is not available. See docs