Why I say so is that there can be many improvements, alternatives to the same issue or topic later. When the thread is alive, someone can give the latest development or update.
For example in explanation, I saw a question thread on Income Tax exemption and methods to reduce tax.
The question was about two or three years old. But a recent answer was posted which showed the latest dimensins as the tax slabs and exemption clauses are amended and updated in the last budget.
So for a person who searches for the matter if he sees the QA thread in his results, he can have a wider view of how it was earlier and how it is now. This is just one example.
'Idhuvum Kadandhu Pogum "
Even this challenging situation would ease
Santosh Kumar Singh
(Sr. Microsoft Dynamics Axapta Technical,Mumbai)
Why not mark the answer that suits you the best?
Moreover if we could lock our own threads,the responses won't be enough and chaos will prevail.
The stronger a light shines the darker are the shadows around it.
There may be other reasons also beyond my knowledge but these are the very general and basic things.
When I joined in ISC then in one of the old forums I had posted my views. Immediately I was informed by editors that one should not attempt to response in a forum after 10 days of its initiation. The point is really very valid as lot of water has flown below the bridge during that period and the thread had been already discussed in the beginning 3-4 days.
Anyway the prerogative of editors can not be delegated to members as that will bring a situation of chaos and anarchy.
Knowledge is power.
I responded presuming that it is about Answers in Ask Expert section. However if it is meant for forum, my stand is that threads may have either auto lock facility based on time elapsed. The thread author can give a follow up satisfaction comment and seek closure of the thread with justification.