Then you don't understand the mechanics or have a high understanding of the technique... and you specifically talked about what people of greater skill and smaller skill can do at 75% effort.. and the vast majority of the time the people who say things like this are hobbyists, primarily train with hobbyists and have limited to no actual decent much less high level wrestling training...
I'm a Judoka, not a wrestler, but I can tell you that you certainly can do throws and takedowns at 75%, 50%, etc. while keeping proper form and throwing mechanics. If you couldn't dial down the intensity of your throws while maintaining technique, you'd run out of training partners too fast for anyone to get good.
If this is true for Judo, there's absolutely no reason it wouldn't be just as true for Wrestling. A hip throw is a hip throw.
Yes you can totally do a throw at 50% speed and it will work against a fully resisting opponent.....