We should answer to the best of our abilities, using available resources if possible (the FAQ, Mark Rosewater's social media rulings, and anything else similarly "official"), and our best reasoning beyond that. That presumably means starting from the available rules, but also includes taking into account gameplay quality: a strict rules-based ruling that completely breaks the game obviously isn't helpful.
It'sTo give some background on the overarching philosophy of Un-set rules, it's useful to have a single canonical question about Unstable and silver-bordered rules in general, covering the "it's for fun, do what you want" ideas. We sort of already have one: Should "standard errata" be applied to silver-bordered cards? asks specifically about errata, but Alex P's answer is pretty general. We might want to post a more clear version of the question, though.
But individual specific questions are totally fine too, and we don't really need to reiterate that full spiel on individual questions; it'squestions. It's unnecessarily repetitive, and besides, people are coming to us looking for whatever advice is available to help them have that fun game.