I've just read a thread that was last replied on April 2019. I believe that need to be Moderated but it's almost dead. is it good to report such dead threads or simply ignore them?
As long you dont report threads and posts that are back in 2015 for spam something like a " Good Project " you can report them if you think its against the rules .
For sure you can report everything you see and think it should be .
Normal dead threads that hasnt be posted in there for the last 120 days should be as they are as long there is no plagiarism or something like Malware links in it !