Thousands of years, the breeding, of draft horses, has been so that their center of gravity is most comfortable/so shifted that he can pull.
Thousands of years, the breeding, of warmbloods, has been so that their center of gravity is most comfortable/so shifted that he can collect.
How many more times must I itterate this!!??
Do not tell me that this:
Are both starting from the same "balance point" naturally...
And yes, you are correct, dressage schooling will improve the way of going of any horse. Your horse improving because of dressage training does not mean it has potential for the upper levels, it just means it has 4 legs and is classified as "equine"!!
Pulling became the focus for these animals has the need for heavy war horses, capable of hauling around armored men, went into decline. If you look at what these horses looked like 600 years ago they were not the the massive animals you see some of them as today. And even today they are not always so large. In fact the Frisian is lighter than it was 600 years ago.