I see the excuse too localized or too short lived far too often on this site. This isn't a theoretical game development Q&A. That would warrant questions that should at least be relevant for a few years. Questions regarding specific frameworks and problems with frameworks are on-topic on this site. So why not questions regarding bugs in frameworks?
Another argument is that it is often not known in advance that it is a bug by the user who posted the question or even by us.
This also raises another question, when is something too short-lived. Even bugs known by the developer can stay around for months or years, doesn't that discard all of the arguments against the validity of these questions?
Personally I think we should try to make our community more open, lately too many questions are being closed because the FAQ is interpreted too strictly (IMHO). Apply the FAQ as a general guideline.