I've heard this many times over the last 20+ years...that connecting rooms are "now guaranteed". Yet, as was pointed out, the fine print of the reservation indicates otherwise. There are many uniformed/misinformed CMs, TAs, etc. who will say the rooms are guaranteed to get the sale or just simply because they *think/assume* that's the case. Our TA *always* told us that while we could request connecting rooms, they were never (other than for certain medical issues) guaranteed so we should always be prepared for not getting them, just in case.
And I've always been baffled with the "guaranteed if there are 2 adults" thing. Why would connecting rooms be guaranteed for parties including 2 adults? Two adults could split up and each take a room with kids. It just never made sense to me (maybe I'm missing something)?
We have 5 kids and needed connecting rooms for several trips. We always stayed at Pop Century because they have the largest number of connecting rooms (or at least they did back in the early 2000s when we needed them). I always made that my only request, and we always got them. But I always had a contingency plan just in case we didn't get connecting rooms. Once AoA opened, we just stayed there because we knew we'd all be in one room (and by that point, our oldest son was in his early 20s and bringing his girlfriend so they got their own room.).