If there's a silver lining to the Palpatine character's depth or lack thereof it's that the Prequels for all their flaws fleshed him out a whole lot more than the OT ever did or even intended to.
The PT movies
sure didn't. Heck, arguably the most distinctive thing we learn about him in the OT - his implied anti-nonhuman racism, as evidenced by the composition of his Navy - is nowhere referenced or
implied in the PT. Even when he declares himself Emperor, he's flanked by nonhuman aides.