And nobody in any of these threads has ever pointed out why it is considered to be insecure. The most probable origin for that idea I have come upon so far is that it is a left-over from pre-SSH days when people thought using the root password with su at something other than the start of their connection would make it harder to sniff. Literally nobody lists even one good reason why sudo should be more secure than direct root login with SSH public keys and password login disabled for full root access (as in not limited to just one or two commands).