Not quite. In Seiken Densetsu 3 (the game in the picture) and Secret of Mana, you are unable to hit enemies on a higher or lower elevation than you.
Did you read past first paragraph of my post? Literally the next sentence I say that it is acting as a barrier. In the fourth paragraph I mention particles.
I call them paragraphs (I guess they technically do qualify) but it's safe to say that they probably only loosely coincide with what one would colloquially consider a paragraph. For lack of a better word I'll stick with paragraph but if anyone has a better suggestion for a replacement term I'm all... well, eyes, I suppose.
Back to the matter at hand, I have not played the game and so was unaware that the specific implementation of the mechanic is as you mention. Even so I think I covered the contingency explicitly enough to preclude the necessity of your comment.