That's entirely missing my point though:
I'm not pointing out that they're OP when paired or unplayable when not.
I'm pointing out that no matter how they're tuned, they're fundamentally linked, balance-wise, to each other. There's no way to tune synergy built into their kit, short of removing it.
It's not a statement of "these characters are broken/useless", it's a statement of "the way these characters are designed makes them literally impossible to every be in a truly balanced state" because they're either balanced around being played together, or balanced around being played apart.
Riot literally can't balance them for both scenarios without introducing a comparably strong bonus on each of them while they're apart, which would feel bad because they're intended to be played in concert.
That's my point: The fact that tuning just outright cannot fix the existing problem, ever, with the way the characters are designed.
I'm just pointing that out and asking how Riot intends to work around that fact, because these champion releases are setting a new precedent.
The only characters with anything close in the way of built-in kit synergy are Kalista and Yasuo, this is new territory, and I'm wondering what Riot plans to do with it.