Scheduling a note for 2024 to necro this thread
There are two sides to a necored thread. One is a continuation of relevant discussion that stalled previously, but remains relevant. ANother is when someone necros a thread and people respond to elements that are no longer relevant or accurate due to changes in knowledge, product or other factors. Unfortunately, the second situation is far more common than the first.
The most common necro discussions I see are where someone has found an old thread, likely via internet search, that discusses a minor rule or opinion and then responds t it - not realizing that the situation has changed considerably since the last post was written.
I've suggested a number of times that it would be very beneficial to the community if there were a warning message when you respond to a thread that has not been updated in a long time. As long as people make informed decisions to respond to it based upon the situation and understand that things may have changed since 2017, there should be no problem.
However, it does get tiring to see someone bring up a thread just to disagree with it because the thread was written before Mordenkainen's was written and the person responding is doing so to say the initial poster is wrong and they can prove it by pointing to something in Mordenkainen's.
I almost always comment on a necroed threat to note it has been necroed just to frame the thread - but it isn't driven by anger. Except in those rare instances where someone did it just to try to ridicule something someone posted years ago.