Yeah but in ROTS he tells Padme that he can overthrow the Chancellor and they can rule the Galaxy together. Molding the Galaxy in their own vision.
Yes, but it’s in context of what Anakain has gone through.
That isn’t an issue. He’s the reigning Dark Lord of The Sith. The Sith want to conquer thus Palpatine wants to as well. There’s no reason to give him a rich backstory that which gives him numerous motives as to why he would want to rule. Darth Sidious is not like Darth Vader or Kylo Ren who are 3 dimensional characters so there’s really no reason to elaborate more beyond the “normal” reasons one would want to rule the Galaxy.
It’s not an issue for you, for me it is. And I’ve already said, you can keep the character vague and mysterious but there have been much more successful executions at doing that. I don’t view The Emperor as seen in ROTJ, and in most of ROTS comes across as mysterious but interesting.