I mostly agree with you, but it's worth considering that there are much more fundamental issues with absolutely abysmal passwords like "123456" . If my password is "ra1nbowC0okies776", and it shows up in another place, it's a pretty strong signal that I reused it, because it's unlikely to have been picked independently by someone else. If my password is "password", even if I never reuse it, that's still far worse than me reusing the password above.
That is completely irrelevant to anything I said. No one on hacker news thinks that using 123456 as a password is a good idea.
You said the password was "reused". I think that's a poor framing and was pointing out.