I have to agree with you completely. I haven’t been riding 3 years yet but I’ve seen my own horse’s gaits improve. I ride with average riders that have noticed the difference. We rarely take lessons and I’m the only one that rides him. I do ride him several times a week. If my ammy a$$ can do it I see no reason why most others can’t.
You said: “I don’t think good basic riding is enough…”
Hugh? its all about good basics. FULL STOP. You watched RD, didn’t you? that is exactly how I like to ride.
Tricks are just tools and products of the basics. Movements are used to produce these basics to a higher degree. HI improves throughness/straightness… and a good walk halt will improve the collection/balance.
Back to the OP- I think the horse regresses to the level of the rider, always. So a nice moving horse will suffer and I was quite shocked with one horse that really looked almost lame with a rider that was not balanced. An 8 mover can become a 5 mover if there is not a good match with the rider, or too much tension.
Likewise, a good rider will improve the loft of THAT horse. A 6 horse can never be an 8
I’ve seen this first hand just last weekend. My girlfriend was riding the mare. She’s very much a beginner who is still scared. She was bouncing around and the horse was very tense. I had her close her eyes and relax. As soon as she did the horse loosened up and moved better. Is this the same as the “real dressage”? No. But it shows full well how the rider affects the horse.