They can't stop you half way through shiho nage and then say "That's an interesting technique, could we go through this a couple of times until I work out how to resist it?"
Funny that you mention Shi ho nage, which is a technique that I have seen many beginners "dance" out of on their first day of training in many dojos. They instinctively felt the hole that most people leave when pivoting behind to finish the technique and simply keep turning until they are back where the waza started.
To resist waza does not require much training if any. To counter it with something effective enough to end or resolve the situation, that takes study.