I did say that a tripod has some uses, but just that I preferred the freedom of not using one. The main reason for my comment about rigidly posed shots and subjects being told to keep very still, was your suggestion for using shutter speeds "way slower than 1/50th second", rather than the use of a tripod.
I agree that portrait implies controlled conditions, but it doesn't have to mean a head and shoulders shot of somebody standing stock still against a plain background. To me, a portrait is all about capturing the essence of the subject, telling the viewer something about them. This will often involve having them doing something, an artist in their studio, a writer in their study, etc. In those environs, as well as a regular photo studio, the ability to move around is, to me, important. I am not saying your way is wrong, it clearly suits you, but I don't feel that it is right to be telling people they "should be using a tripod" as if it is the only way of doing things. I never said that people shouldn't use one, I just gave a counterpoint and stated my preference.
The only part of your post I said shouldn't be followed, was the part about using such slow shutter speeds for a portrait just because the tripod will stop camera shake. It won't stop subject motion blur.
OK, thanks, I agree with what you say!