We only know two things about being a Dyad - You can connect to each other remotely with the Force, and “A-newly-cloned-body-of-an-ancient-decrepit-Sith-Lord-can-absorb-most-but-not-all-of-their-combined-Lifeforce-energy-in-order-to-revitalize-his-body-change-his-eye-color-and-regrow-his-fingers-if-the-two-are-standing-next-to-each-other-in-front-of-him.” That’s just Storytelling 101, people.

If anything, I say cut the Dyad concept from TROS. At least in TLJ, Snoke bridging their minds is thematically relevant and conceptually nuanced.