"But it's only 12!" This is B-level Walrus thinking. The 10s. The fit. Even the Q in the trump suit (because it's useful, and worth more than say Axxx Qx in the pointeds).
Some of it is also B-level "can't trust partner". They'd never say that - and they'd never mean that. They wouldn't even think it. But the experience is still there and not beaten out of them yet. They'll be concerned that "3
♠ shows slam interest, and demands cuebidding" and get to slam with random 13 with the 'right' controls. Which, in another auction, maybe yeah, but you can't steal captaincy from partner in this one - at least not yet. And they do it, and get away with it most of the time, and the times when they miss a great slam are still overshadowed by (historically and currently) the times they get to 5M-1 because their partner's judgement *isn't* good enough.
As for 3
♦, I'm with MikeH, only more so. I was thinking Qx KQxx AQxxx xx. Oh, you wouldn't open 1NT with that? What do you open then? And what do you rebid after 1
♦-1
♠?
And I'll challenge you a bit on the location, too. Unfortunately, they don't play here any more since coming back from "the issue", but
twice a week here (with one drink included in your US5 entry) almost was worth the humidity. Almost.
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)