Unless otherwise specified by an post edit or a thread reply, all official responses posted this season should be considered valid, whether they were posted by this account or by Karthik. When issuing a correction, we will usually change the “Answered by” highlight to the new corrected version.
This is a very context-sensitive question. The posts that you linked are a good start. The Q&A Summary document also includes some additional posts that cover this issue, especially the following one: