Everyone has their opinion however luckily it can be settled by the Community Code of Conduct which clearly states:
1i. Pointless necroposting (posting in a forum thread that is too old to matter any more, or has served its purpose)
Some people won’t tidy their house or throw anything away just in-case it might be useful one day. Luckily closing a thread isn’t throwing it away. Devs can still hit like if it helped them or as said above, it doesn’t stop devs creating their own thread with their “revelations”.