In regards to your question of buying a foal, in which case the answer is yes.
Horses are like puppies. If you were to buy a Foal, you could train it the way you like, and it would be totally dependent on you. We've owned horses before, that were broke by other people. They ride fine, but the people before may have been rough when handling it, ie:
Say grabbing a ear to pull the head down to put the tack on, so of course the horse could become ear shy and it may be difficult to put the tack on.
Everybody trains their horses different, each horse owner is different in their approach.
If you're interested in buying a horse, try going to different stables and talking to trainers and see if they could recommend a horse for you. Most sellers will let you take the horse home and see if you get along fine with it, before you cough up any money.
Money is also a issue. They range in all sort of prices, from $500 up to millions. Most cheaper horses may have problems, so vet bills will be higher, albiet I've bought horses on the cheap side and they turned out to be great. Best idea is to bring someone familar with horses with you, so they can identify any exsisting problems. Nothing is worse than buying a horse, only to find out it's seriously lame and reduced to being a field horse only, not even good for pleasure riding.
A lot of people (mennonites) around here sell cheaper horses, figuring if they get $700, great, if not they turn clip clop into sausage.
And no, horse meat is not disgusting, but getting ones head around the fact it's a horse can be difficult.