I’ve seen this exact scenario play out on this forum, multiple times now in fact.But more often than not, what they've failed to mention is that the fish won't be alone!! It might have a couple of similar sized fish with it and a nice school of dithers to give a bit of added sparkle.
You’re absolutely right and you have me convinced.That's one of the reasons I hate the term "minimum tank size" so much. It just seems so outdated and unhelpful.