I feel the opposite way, Burbin. I think that Palpatine was a bad villain for TROS precisely because he came completely out of nowhere. Removing all connections to Snoke and the First Order would only make it seem more random.
It’s like if the Empire were the main villains of ANH and ESB, and then they were sidelined in ROTJ by the Yuuzhan Vong coming out of nowhere. It would be completely nonsensical.