Anybody who spends regular time here over a period soon learns that some threads are off topic and not worth opening, other, once-valuable, threads wear thin or become repetitive (or repeated with similar new threads opening) and aren't worth a re-visit.
They become like known pot holes on the road to work. You just steer around 'em. Easy.
On the other hand, there are newcomers -- several noobies register everry day, and gosh knows how many casual lurkers pop by. To many of these folks, such threads are just what they were looking for and appear fresh.
Don't slap them down, just move on to the next thread in the list. They're hardly forced on us as compulsory reading. Cheers. Neil