SE sites like Stack Overflow, Super User and Server Fault often discourage questions that concern obsolete technologies and hardware.
Some also discourage seemingly "unprofessional" practices such as non-updated operating systems, older browsers, etc. The question guidelines also mention that the question should demonstrate a reasonable amount of "professional" practices as part of the question. These words can often itself be subjective, keeping, say, top tech companies at the highest level of the spectrum as the "gurus" of best practices.
Other organisations may have applications that rarely/never need to connect to the Internet or never have any use for the "latest" or the "most secure" practices. (Example: tiny struggling startup-charities in third-world countries or individuals who are fanatic re-use enthusiasts or objectors of periodic obsolescence).
Some, for example, may use old programming languages such as FoxPro, that can run on Pentium 4 machines or use Microsoft Word 97 for word-processing, and they may not have a use for the features that the later software offer.
So, if people are using technologies/hardware that are best optimized for the resources they have access to, and if there are enough people to answer questions, why should the questions themselves be discouraged or banned?
Why can't they be allowed a place in the respective forums? Why should it mean "one size fits all" when it comes to "professional" practices ? In any case, if there aren't enough answerers, the questions can lament in the unanswered section, right?
What was the rationale to discourage obsolete technologies?