- As far as I know, Raze is the community manager
And support.
I think he said at one point that all he sais is his own opinion and he has no special information what the devs are thinking.
That depends on the situation; I wasn't following BG3 development before the official announcement, for example, but have seen discussions and brought up issues with the design team. In this case I have not specifically checked with anyone involved with the UI and control design, but if it was generally considered to be a worse design, there was lots of time to change it.
You can define a button to select groups. You select a group of whatever chars you like and assign a button to it. This plus a "select all button" should be more than enough to control all chars without moving portraits.
Yes, this, or at least an ungroup/regroup function, would be useful.
Dragon Commander allows assigning groups of units to hotkeys to control.