It is COMPLETELY dependant on the training. We bought a Paint x Clydesdale that had been treated as a pet his entire life, and he bit and kicked whenever he was asked to do anything. Needless to say, he didn't stay with us for very long. He's now in training with a great couple who have the time to re-train him from his spoiled mindframe.
But, right now we have a very nice 12-yr old Percheron who is absolutely a dream to work with. She is very sweet, respectful, and learns very quickly.....her temperament is great because she was raised right.
In some cases equinphile, I might agree, but not always. As you know, my daughter has Gypsy Horses and several have been imported. In the UK, many GHs are kept in large fields, for the majority of their lives and never handled.
If and when they become sold to the US and other countries, they are suddenly gathered up, given shots, halter on, loaded in a truck for a sometimes long trip to the airport, given a required bath by airport handlers (the first in their lives) and led up the ramp and into the plane for the long trip to the US.
Almost all, and of whatever age, take this all in their stride. Once in the US, they are again loaded in a truck and off to quarantine. Then another truck ride to the buyer's home. Some even have babies by side.
For most breeds it would not go nearly as easily. I have seen several movies of this from beginning to end and it still amazes me that these horses almost always, just go along with it all, as though they have been handled all their lives. I can't imagine doing this with many breeds - light or draft. Maybe it's why we love Gypsy Horses so much.