when I got my PPL back in 1975...US recovery was part of the exam.
same for my instrument rating.
didn't see it again except when I taught it to my students.
and didn't see it till after the airplanes augered in with rudder hardovers.
BUT I NEVER FORGOT HOW TO DO IT...it isn't that hard.
as to using gliders to manage energy...well, just flying the plane teaches you that...I've never taken my transport jet out looking for thermals to glean a little bit better fuel consumption number.
the best way to LEARN anything is to learn it and then TEACH IT.
Lindbergh said he learned more about flying by teaching than anything else.