Why is it not a sport Bazile? Can agree that for non horsey folk it is a bit baffling and perhaps because of this they find it boring but that doesn't make it a non spoort surely?
There are a lot of events that seem ill classed as "sport".
Certainly anything that depends on someone's opinion of how nicely you do something, is rather questionable. As is anything that doesn't have the physical demands to ensure you break out into a sweat.
You obviously don't know any thing about dressage or horses, O_G. The rider is not doing things, "nicely." They are making the horse do incredibly difficult manoeuvres thereby, showing their skill and lightness of touch of the commands.
It is incredibly difficult, and huge amounts of skill and training on behalf of both horse and rider are required.
It requires skill, fine. Many things not classified as sport does.
For sure I don't have much interest in dressage. These incredibly difficult manoeuvres, are they judged to have been done nicely, or is there an objective measure ? This lightness of touch, does it require a lot of exertion, perhaps sufficient to cause the "sportsperson" to break into a sweat ?
OG have you ever tried dressage? As a not very good novice rider, I have had a couple of goes on “schoolmaster horses” You may not see the sweat by by God its there. It works every muscle in your body...even more so because you have to show no outward muscular effort.
Whether things are classed as sports or not is always a thorny issue - I don't watch much but do appreciate the skill.
For a comedy approach to Dressage, Eddie Izzard has a great if irreverent sketch on the topic - links are not working for me today and it would perhaps be out of place.