I recently upgraded a community and we noticed guests no longer get the ?do=getLastComment link on "timestamp links", for example the timestamp link in the last reply column in topic lists. The link is now the same as the title link which just goes to the first page. 

This is currently intended for Guests. It was removed a little while back, forget which release specifically.

You can find information about this change here: 

 

I think it's good SEO-improvements is done, but in this case I feel it's at the expense of guest user experience. Why can't this be solved with indicating nofollow or adding it to robots.txt? If the link is not gonna take you to what you expect as a guest, then why have it be a link for them in the first place.