I think my training was more similar to the WWII era than what goes on in many dojos today (often less focus on the ground work today than I experienced). My instructor was of that era (and pretty traditional), and we used the gi heavily in throws, locks, and chokes. But all that was easy to translate to NOT grabbing the gi so often.
It's only easy to translate, under stress/duress, if you've trained that way consistently. If a student uses the gi heavily in training it is not reasonable to expect them to do something else in the heat of a confrontation. How you train is how you react under stress. As I've discussed before, L.E. training and military circles have know this for decades which is why training has had to adapt. If the Judo training didn't rely on a gi, or any specific clothing for that matter and if it was trained with a methodology of an actual attack with a violent aggressor rather than match with an opponent then it could be a useful tool. Same with any martial art of course.