It's stronger because you say it is. K.
It's on par because you say it is. K.
Then you make a post mocking mine because you disagree with it.
Yeah, I'm bored with this topic, and arguing in circles will go on forever. You are never, ever getting Frostmourne, and it is totally your choice whether or not to be salty about this. It doesn't change the fact that Frostmourne is one of the most powerful weapons in the lore (the Lich King's primary strength, which is saying a lot since he is, by lore, one of the only characters to have ever truly defeated the heroes of the story).
But I mean, sure, let's make up stories to try and pretend to justify your obsession with this weapon. Perhaps we should toss in the Helm of Domination too, since that clearly is a weak helm, obviously weaker than generic Azerite helms. Let's just call you the Lich King.
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The Sceptor of Sargeras was only powerful when empowered by other artifacts in tandem. By itself, it simply is not as powerful as Frostmourne.
And now you are claiming other random artifacts are more powerful than Frostmourne as well. Lorewise, you say, well feel free to share this lore if you like, otherwise my opinion remains the same; that this is absolutely laughable. The Scepter of Sargeras is debatable since when empowered it actually can be stronger, whereas these other weapons are nothing in comparison. I mean, really now.
I get that you love Frostmourne and would love to be able to use it as a transmog option. It's a fantastic looking weapon. But it's the Lich King's signature blade, shattered and destroyed. Bringing it back, even as a non-canon transmog option, would be insulting the lore behind it. Bad enough we have thousands of paladins running around with the Ashbringer, but this is ridiculous. No.