Ive been doing TJF for +20 years now, (started ariound the same s=time as sensei dobie) and I would say that from working with the current NNK programme weve been using in the UK over the last 2 or 3 years that Ive had some real leaps in understanding of throw mechanics.
I dont know if wha we are using has made it across to Canada yet, but its hugely different t the rubbish that Andy and I were originally taught.
I think it does build those neural pathways for throws but also moves your understanding of kuzushi, footwork etc no matter what level you already at.
I have to say Im shocked that anyone who has access to Andu Dobie would feel that the wristlocks, dangerous parts, and standing armlocks we use are ONLY effective against drunks or weaker opponents, Im barely 11 stone and 5'8" so Im short and small. Ive used wrist lcoks and armlocks against larger sober people while working doors and the right DP will work if done properly regardless of opponents size.
(ok true headlocks and leglocks are specific apllications but I would still question they wouldnt work aganst sober larger people - they just arent practical in a street fight - same with arm locks some Id use some I wouldnt).
Id also say that in the UK we ARE focussing on a LOT more ground fighting and I dont think its affecting numbers at all.