Why is there a kind of stigma about commenting on posts that are too old?

The problem is a few users on here are really dead. You never know when anyone is going to pass away. So you might be talking to the dead. Literally or figuratively.

Many do have that problem. They want to talk to the living, not the dead in any case. It's weird to expect a reply from a dead person. The same on a dead account.

And people are very touchy about viewing profiles.