Right, okay. So the Fett clones were all phased out…
But Palpy wants to bring a clone army back…
So,
In all of Palpy’s immense wisdom…
He decides to do the only logical thing and yet again, clone the same guy who died over 60 years ago despite the fact that he possesses very few special abilities and there is already a large enough First Order army as well as an entire planet (Exegol) of humans who have already devoted their lives to him to a point where they literally resurrected him.

The Fett clones came from Kamino, so why would these clones on Exegol turn out the same?

Also, the cloners on Exegol have proven that they can clone force sensitive people, so if you wanted to clone an entire army, why wouldn’t you create an army of Sith lords instead of Jangos? That would beat the cavalry!