I’ve seen your update indicating a likely change of mind on this, but I thought I would share my experience regardless.
I do not recommend buying a foal for anyone who only has a one-horse budget and who has specific “wants” in a horse (as an adult). There are just no real guarantees, and by the time you account for the money of the initial purchase, money that’s gone into upkeep, money that’s gone into training, the point at which you figure out the horse isn’t for you? You’re not likely to recoup lost costs. Additionally, if you’re like many amateur riders out there, your budget/situation is one that will only really allow for one horse at a time. By having a horse that ends up being unsuitable that you need to find a new home for, for most of us that means that we have to wait that much longer before we can really put our time, finances, and attention into finding the horse that is right for us.
This all sounds a bit negative, I know. I have done the foal purchase route. Frankly, while I value my experience, it’s a large part of why I do not really advise the standard amateur do it. I did a ton of research and set myself up for success with a really well respected program/breeder, knew bloodlines inside and out, really did deep research on the relatives, met the dam in person, saw the sire’s performance record and studied him at shows. Despite this, I still will not end up with the horse that I “want” on paper. Both parents are over 170cm, I will be lucky if mine ends up breaking 166 (and I am a tall rider, so height has always been something of a selection criteria for me). When I got her she was already well handled, and her pedigree is notorious for breeding animals that are exceptionally well tempered. That doesn’t mean she hasn’t still had extreme baby moments that I, as a first-time handler of youngstock with no education, had to struggle through with how to navigate.
And this is all factoring in that as a rider, I have a wide spectrum of horses I enjoy riding. I don’t mind snarky, I don’t mind quirky, I don’t mind eccentric, I don’t mind worried or marginally fearful or opinionated, super forward or a little more “eh, convince me”. If I had really purchased based on “wanting a forward thinking/energetic animal as an adult” I would be soundly disappointed with how laid back mine is now. (And vice versa is probably more common - wanting something a little more sensible/perhaps not so intensely forward or reactive, but ending up with just that.) Many amateur riders are not particularly diverse in regards to the type of ride they enjoy, or that they can really successfully navigate - and it’s compounded because, we have to remember, there is a wide gap between “greenbroke horse at 3 or 4 who has had all the basic education markers met but is just green” vs “a baby who has had no exposure or education because they’re a baby”. I rode greenbroke horses for years for my instructor and was very, very good at it. Very little of that skill set has come into play with bringing along a foal, other than being able to just hang cool and not overreact. It may come in handy when she’s doing more under saddle, but for actually having a foal? Not so applicable.
In general: If someone is set up to only be a one-horse owner, and they have a specific list of requirements of their horse, buying a foal is not something I’d really recommend. There’s no guarantees, and most of us are terrible at actually calling it when we have a horse that we need to move on because of lack of suitability… so we just end up prolonging the situation before we can really come into our own with a horse that is more suitable for us, and exactly what we want besides.