Indeed, Machinbird
If glider is certainly a good step in early pilot curriculum, I do not see his benefit for kind of recurrent training (same idea for light aircraft recurrent training)
How a glider, a Cessna, whatsoever, could be helpful to restitute pilot feeling when this pilot will probably fly an aircraft with autotrim, without real effort restitution on joystick, without moving thrust levers and different flight controls laws...
Illusion..