I agree with Morrus - if the another discussion thread is really very recent, we might merge the two. But in general, do what you want.
I will note that not all recognition of duplication or necromancy are chastisements. If you come in and say, "I am interested in Giant Chickens!" pointing you to a recent thread on Giant Chickens is giving you information. It may get you at much of what you're looking for far more quickly than having the discussion over again. It may be trying to help you to not re-invent the wheel.
And for thread necromancy, I have seen several threads go by where it is not obvious, but there has been some major shift since the old thread died. Like, a person is trying to discuss 5e, and revives a 3e thread on the same general topic - the previous discussion may not apply, and that is good to know before you continue.
I will note that not all recognition of duplication or necromancy are chastisements. If you come in and say, "I am interested in Giant Chickens!" pointing you to a recent thread on Giant Chickens is giving you information. It may get you at much of what you're looking for far more quickly than having the discussion over again. It may be trying to help you to not re-invent the wheel.
And for thread necromancy, I have seen several threads go by where it is not obvious, but there has been some major shift since the old thread died. Like, a person is trying to discuss 5e, and revives a 3e thread on the same general topic - the previous discussion may not apply, and that is good to know before you continue.