Last Jedi used Sidious and Rise of Skywalker used Palpatine based on the desire of one filmmaker to tie into the entire saga, and the other to just make a sequel to his film from four years prior and tie into his childhood toys.
That’s some major reaching. Just because Rian used Sidious doesn’t mean he wanted to bridge together the saga, and just because JJ used Palpatine doesn’t mean he only cared about toys. I feel like your whole “Rian is a true auteur, JJ is a lazy hack” thing sometimes causes you to make unnecessary assumptions.