This is a mod for SKYRIM, right? So why is Morrowind forced? Recreation or not it is still a mod for skyrim and by forcing people to have Morrowind you are effectively messing over everyone who:
-Wants to see how Morrowind is on the game they already spend a ton of money on before they buy the official version.
-Anyone who had paid money on the game and has since lost, deleted, etc their copy of a game that is ages old and they stopped playing or was possibly even lost not by choice.
-Anyone who had bought game on console.
Having a legal copy of Skyrim, yea of course that makes sense. But why is this tactic being used that is pretty junk towards plenty of people who probably would have otherwise supported you despite them having completely legal copies of Skyrim, the game being modded in the first place from the ground up. That seems all sorts of unethical. And no this isn't just a complaining post... I legitimately want to know why. Cause it's quite unfair to a ton of people and I want to know the reasoning behind it.

Basically, not forcing you to
Basically, not forcing you to have Morrowind to have the mod would effectively give you a better and more improved Morrowind for free, which is Illegal. Regardless if its recreated or not. Morrowind is cheap so having to rebuy it shouldn't be an issue. To sum it up, its for legality issues.