Hi, just wanted to add something quick! I'm not very experienced though, this is just about some of the horses we have!
If you're ok with getting a cross, we bought a Clydesdale x Thoroughbred a couple years back and she's great! She got the Clydie's temperament and size, and the Thoroughbred's more sporty aspects. She did eventing to a rather high level, as well as dressage (she's the most educated horse we have!), plus she looks super 'drafty' and has a great temperement..not hot at all. So, if you are wanting something you can do dressage and trail riding and all that on a bit easier, maybe look at some crosses. (If you do though, make sure they have good hooves...our horse got Thoroughbred size hooves, and with her size and all the eventing she did, it means she has ringbone and other feet issues now)
My dad also bought a young purebred Clydesdale who is also on the road to doing good dressage, so it's still possible!
Obviously, not all horses are the same, I just wanted to point out that you can do a lot with drafts and draft crosses if you get the right one.