Again, we could argue semantics all day long, but generally speaking, people who are visiting the forums and are wishing to discuss "pinching" are usually riding an off-road motorcycle of some kind. Trials bikes don't belong in the same class as off-road bikes in my opinion, as they not only are totally different in design, but are even ridden totally differently. Its like comparing a down hill mountain bike to an off-road dirt bike. There are similarities, they can both do the same thing in reality, but we don't talk about MTB riding here because they are way smaller and have no motor. Yes, Trials techniques are great for slow situations going through super technical terrain. In fact, Shane Watt's and Kurt Caselli, teach trials techniques in-parallel with off-road/motocross techniques in their training videos. Guys like Taddy Blazusiak, use trials techniques all the time when riding enduro, its critical. However, once the speed increases, he's back to running off-road/motocross riding techniques.
So yes, speed dictates which skills you use. If your doing low-speed technical riding, then pinching isn't as important to learn. However, when one thinks of an off-road motorcycle, one should first think of going at a good clip speed wise. Which is where techniques like pinching belong...
I'm still amazed that you seem to pigeonhole off-road riding to only the stuff you do. The original question was specifically directed to woods and trail riding, in Kentucky.... which doesn't sound like first thinking of going at a good clip speed wise.
I rode dirt bikes from the age of 4 to the age of 32 before I got into going fast as a goal. I've done a couple of hare scrambles now, and I'm still slower in the open sections and fast in the technical sections. I attribute my slowness in the open sections to not gripping the bike enough. But "when one thinks of an off-road motorcycle, one should first think of going at a good clip speed wise" is just the way you like to ride, man. It's not part of the requirements for enjoying a KDX/XR/EXC/KLX, etc.
The main thing that people seemed to be disagreeing with was your attitude of completely disregarding other people's experience and saying that somehow what they do isn't off-road, when for many of us, it is the epitome of off-road. There are tons and tons of posts regarding trials in the off-road section.