The reason for the closure of Cabanas 9B has not been publicly disclosed. Some have suggested a DVC expansion, others have suggested some sort of facility for conference guests. Seeing lanyards and suits on property every day of your stay happens at the Contemporary as well. That is a far cry from suggesting, as you did, that staying at Coronado you are surrounded by conference guests, which is not the case.
Also, I'm assuming from the fact that you haven't actually said that, yes, you have stayed at Coronado, that you really haven't. Because saying that you have "dined at and explored" the property is pretty much saying, as I and others said we suspected, that you have in fact never stayed there. Running into conference guests at table service at any Disney conference hotel is not surprising. When you have actually stayed at Coronado, woken up and walk out your front door headed to rope drop, fed your kids at the food court, or done the many other activities that you would do at any resort you might stay at as you come and go through the course of your day and your stay, beyond simply showing up at dinner time for table service, you might have a different opinion.
That's exactly why I asked you whether you had stayed there. Because it was pretty clear that you had not.