Bruce wrote:

This is the kind of rigid thinking that kills people.

You can't be rigid enough when it comes to final approach speed.

If you teach that the
needle has to be ON the yellow triangle, what happens to the pilot when
he suddenly notices the glider he is in doesn't have one.

Yeah, yeah, yeah. I would expect from a glider pilot that he doesn't
"suddenly" discover on short final that there isn't such a triangle, but
that he familiarizes himself with the glider before the flight. If he
doesn't, then many other things have gone wrong during his training.

For every weight and configuration there is a stall speed.

Of course. But the other poster proposed to slow down to the point where
you get a steeper approach. For me, this is a *very* rigid no-no. I
don't think that rigidness in this point kills people. I even tend to
think the contrary.