The pool being down would be a deal breaker for me as well, assuming I planned to spend my entire Vacation at the Poly.
Because I expect the pool to be down when we visit in early May, I've thought about splitting between Poly and CR and then, for the Poly leg, requesting a longhouse on the west side of the resort (we'd just stay in a GV room, so I'm thinking of requesting a Monorail facing room in Aotearoa).
While I'm not normally a big fan of the west side of the resort (normally prefer Tokelou), during the construction, I'm leaning toward the west side (particularly Aotearoa) because it's farther away from construction and closer to the pools at the GF (I would prefer to walk than take the boat shuttle).
Right now, I'm only booked at CR as I'm waiting to see what's going on with the GCH (if there's major stuff going on there AND at the pool, then I can't even justify Poly for part of a split stay). Hopefully, we'll have more information on this by the time they release GP room discounts (which, for my dates, will likely come out in late December or early January).