I always read the whole thread if it’s one to which I’m going to add my ‘thoughts’.
Often, while reading through posts, the situation will have been resolved, but still others continue to add. On other (frequent) occasions, an old thread, often several years old, is resurrected by a spammer - then GNs continue adding to the thread, apparently without noticing the date on the OP. I was rebuked for reporting such a post, as subsequent posts were probably giving incorrect legal information to the outdated thread. Another spammer I reported resurrected a thread about cleaning products and I was told that the thread was still of interest - but if it was, why had it taken 2 years for others to add to it? Just start another thread?
I remember a couple of years ago, when an OP was asking for advice about her elderly mother. She later posted that her Mum had died, but the thread continued to be added to by GNs who obviously hadn’t read the thread. I felt very sorry for the OP and hoped she didn’t return to her thread.
On a similar topic, I wonder if GNHQ should remove whole threads that have lain dormant for years?