Uh… two is better than one? I guess?
TestingOutTheTest suggested keeping the “lifeforce of your bond” thing in, which sounds just as handwavy as a Dyad without distracting us with proper nouns. If Palpatine was Snoke, then Snoke giving them a bond could be a long-game setup (in story payoff, not literal planning) for Palpatine to drink that bond up. Would just need to lessen/cut out Palp’s surprise when it happens, along with Kylo saying in the hangar that Palps doesn’t know.
How many times do I have to say this? Snoke and Palpatine aren’t the same individual; yes, Snoke listens to Palpatine, but it isn’t like he is some sort of VR avatar Palpatine controls.
Regardless of this apparent fact, the text of the film makes this ambiguous. When Palpatine tells Kylo that he has been every voice in his head, and demonstrates this by literally using Snoke’s voice, it makes Snoke’s status as an independent individual unclear to the audience. Sure, maybe Snoke was his own person, but Palpatine also occasionally spoke in Kylo’s head using Snoke’s voice, but that is left up for the audience to interpret, and I guarantee not everyone came out of that film with the same interpretation (which I think this thread demonstrates well enough).
The movie leaves a lot for the audience to figure out, though, and if I have to go find external resources to have that question answered, or have some stranger on the internet lecture me for not understanding it, then I consider that the filmmakers’ failure for not being able to communicate their intention to the audience clearly. Maybe they wanted to leave it ambiguous to maintain a little mystery, but you seem adamant that there are hard answers to all of these questions. But if I had to guess, the filmmakers were honestly not sure what the answer was themselves, and left it ambiguous so someone else could answer it, or let the audience pick whichever interpretation they preferred.
Maybe I’m just not smart enough to understand the nuanced storytelling that is The Rise of Skywalker.