When scratching for lift in very tight turns and nibbling the stall buffet, you do learn a lot about the effect of bank and g on stalling.
I agree.
gliders are much more benign than most light aircraft
Not necessarily. E.g., an SZD-50-3 Puchacz, or an IS-29D2 Lark, is considerably less docile than a 'stable Mabel' airplane like the Cessna 150 or a PA28.
a skidding turn onto finals is far far more likely to result in a spin than a well banked co-ordinated turn.
I agree.