“In reality these pilots will have had less formal training in many cases then a JAR PPL A and are therefore more likely to cause problems!”
A PPL A is likely to fly with an instructor for 1 hour every 2 years. Your average glider pilot with an xc endorsement will have flown probably 10 times with an instructor over a two year period. He is also going to fly more hours and be more current. In gilding the CFI and duty instructor has much more say in your day to day flying and falling below standard just once will get you put straight on checks. By comparison most PPL a’s are unsupervised.
As an ex glider man who also has 16 years power experience, I am quite happy sharing the sky and see no reason to criticize my fellow aviators just because I do not understand them….
Rod1