

Absolutely 100% agree. Internal consistency is where the key is. And in order to have that consistency, the rules for the worldbuilding must be relatively clear and well established. It’s really interesting where a few fantasy/scifi creative ideas can take you if you start unraveling the consequences those ideas have on the rest of the created worldbuilding.

Why have fun? :) Actually that’s fair, I hope the answers you are getting provide some insight and aspects to consider.
In a way, what you are doing asking why people would discuss such topics, is not too far as an idea from someone asking why one superhero would win against another or how a lightsaber would work against some fictional material. It is about sharing and discussing ideas that are or can be interesting.