I agree with you in that it has a legitimate place in riding - especially when travelling longer distances at speed.
What really does make the hair on the back of my neck stand up is the way it is generally taught in the US with people being taught to get into two point and staying there throughout a round of jumping.
If it is you in the picture then you know that two point is valid between fences especially CC but unless you are sitting up going into and as the horse lands from a fence, especially CC, then you are very insecure.
Even jump jockeys, riding with a two point seat, will be sitting down going into a fence to drive the horse forward and be in a backward seat but slipping the reins, known as hitting the buckle, when they land.
Yep indeed. Half seat, jump seat and forward seat (Eng) and all based on the Caprilli style is well known but I struggle when I see photos on US forums labelled "two point" and "hunt seat". Just not seeing at all the required position to enable the horse to free the back and loins to get his back legs under him or to allow him to stretch his head and neck as he reaches out with front legs.
The freedom required to enable this and change balance quickly if required by taking weight off the back by rising from the saddle by placing weight through the knees and heels is just not what I personally see when folks talk "two point" and "hunt seat" and post photos.
To me there should be a leaning of the upper body forward and maintaining balance over the heels with a good line through the body showing hips pushed back so there's as much weight behind the heels as in front so weight can easily shift forward and back to follow the horse's movement.
Most often though photos show someone lying rigid over the top of the horse with their butt sticking up in the air in a very artificial manner suggesting severe constipation and often when jumping something just 2 feet high from real slow canter!
Oh and yes... I was being sarcastic. I'm English. So of course I was being sarcastic. It's what we do best and right up there with irony.