SSD.
It seems that you are obsessed with the idea that anyone mentioning the phrase "stall speed" obviously has no idea of the concept of the subject.
Oh dear indeed, I am becoming increasingly as frustrated as Aerials and others.
Please tell me what words you want written down & in what order to convince you that some of us here, myself included do actually understand.
To keep banging on about angle of attack as if we don't get it is not getting us anywhere. We do "get it".
The problem is convincing you that we get it.
You can't spin, stall, and generally chuck a glider about with the entire panel covered with a sheet of paper as we used to do years ago without knowing that the ASI is not required. That you "feel" the stall. How else can I put it?
Then when someone in all innocence asks, what speed does it stall at? All hell breaks loose, the ****e hits the fan, and instructors go blue in the face with utter joy, "We got another one here boys".
OK. No calculations, No Speed, Just Angle.