>>58406689The problem with a Unova revisit is that the very idea can generate an extreme amount of hype due to the existence of the Original Dragon, and fans have been yearning for the day they can properly reunite Reshiram, Zekrom and Kyurem to rebirth it. They can't exactly openly come out and state "This game will not allow you to encounter the Pokemon that split into Reshiram, Zekrom and Kyurem" at the earliest possible convenience, it would be completely unprecedented and come off as very awkward and likely murderous to the game's reception, because that's honestly the strongest defining hope of a majority of Unova fans aside from "let's meet N again and see if he's gotten any closer to fulfilling his dreams" or general fujo fuckery.
That's why they instead give it a strong amount of reverence through non-revisit means, like the striking amount of Hisuian Forms for Unova mons and Ingo's reappearance in Arceus, and the entirety of Blueberry Academy in SV, as it keeps the expectations low.