Perhaps the implication here is that the design philosophy behind these games (at least at the moment) is "Keep doing new things."

I shudder to think of how politically agro-cragged the video game business is, especially when dealing with such a monstrous hit series as FF. Doing a new FF with a theme that is similar in any way to the theme of a previous game holds the potential to draw enormous criticism.

But eventually, you run out of themes! There are, as they say, only seven stories. If they keep trying to reinvent the wheel as far as the thematic content of the series goes, it's just going to get more and more watered-down and incomprehensible in the end.

I don't see a reason why a main character being a knight of the realm would hurt the series. It doesn't have to be set in a medieval setting...

knights!.jpeg
...We do have knights in the modern age, after all.