But if it is something that is still a misconception or there are misinformation about it elsewhere like "SegWit 'removes' signatures from transactions" (which is wrong BTW) then it's OK to create a new topic about it even though it was discussed before.
Yes you are right. For example the hot topic now, about CZ and sam, Ive seen different threads and based on the updated issue like, Binance planning to acquire ftx, then the next thing is the deal was cancelled. Thats another topic out of the rebuttals that they did.
Its all about the information. We can definitely have some exception to new threads having some changes or like you said misconception.