We can have a long debate on this but having some experience i think we both will agree that executing the technique in a dojo and doing the same on the street are two different things in the street fight a person might panic and that can mess up his technique so if you learn a specific throw or take down and start considering yourself toughest guy around sooner or later you will get your a** handed to you.
The issue you seem unable to grasp is that sportsmen have their techniques and physical preparation tested time and again in competition. It is the single most close event to a real fight (including a great deal of arousal and axiety)which you can have without actually training by going out and beating ppl day after day in the neighborhood. It gives you invaluable experience. And this is the reason why competitive fighters in boxing, judo, bjj, wrestlers, mt reign supreme on streets in unarmed combat. Between sparring and competition, they will get an experience in combat most humans only dream of. Self defense trained or not.
In practice what you have most of the time is ppl who says Uchi mata wont work, Kani Basami wont work , boxing sucks, that wont work, and then they get thrown on street on concrete, or get KOed by a boxer who only knows 4 techniques, jab , cross , hook and uppercut in 3 seconds, and the next thing they need is an ambulance