I don’t think having a subtle tease of a voice that may or may not be Palpatine saying “Find me” at the end of TLJ precludes pushing the reveal of Palpatine himself in TROS back a little bit, personally. If the movie had came out with that exact tease, people would have been arguing about it for 2 years with tons of people being in the “There’s no way it’s Palpatine” camp.

In general, I think subtly teasing Palpatine through both TFA and TLJ helps to make his sudden appearance in TROS feel less jarring, and while it is important to not overdo it in TFA/TLJ, I think Poppa has struck the perfect balance here.