I agree 100% with the tack issue. Unless you ride western, you are not going to find any quality saddle. My son rides english and english draft saddles and bridles are practically nonexistant.
Also, agree with the extra cost in farrier work and even small things like wormer...take two tubes.
On the other hand, I can list a thousand reasons why I love my draft....
They are fantastic, family friendly horses.
Unless the draft is in heavy work, most cannot have grain....or shouldn't anyhow....they are usually extremely easy keepers....prone to fatness. Keeping their weight down is usually a battle.