With a reaction to that I expected overwhelming technical objections to everything the parent said. Based on the actual contents of your objections, I think you would have been better starting it Yes! Additionally...
All the great-grandparent's points are true, but irrelevant. There are plenty of ways to improve SSH security. None of them make having passwordless keys anything other than utterly brain-damagedly stupid.
With a reaction to that I expected overwhelming technical objections to everything the parent said. Based on the actual contents of your objections, I think you would have been better starting it Yes! Additionally...