A horse with poor conformation might be inefficient and uncomfortable to support its rider.
If you plan to ride horse on a regular basis, your horse's conformation is important because it determines how horse will perform and move.
However, if you plan to buy a horse primarily as a companion or for pleasure riding, then bad horse conformation is not a serious issue.
Many horse lovers prefer horse with good horse conformation because it is common for such horse to have better athletic ability and move naturally. However, horse with bad horse conformation can still display excellent athletic ability if he had proper training.