I am not a professional orchard grower, but I believe that they are stumpy because of their trimming to the branches and trying to keep them from getting too tall. However, some people just put a big thick blanket under the tree when the fruit starts dropping and they gather them later in the day or in the morning. Trimming the branches and pruning allows for better, bigger, jucier (is that a word?) fruit. Just remember to use that branch spray when pruning to keep insects and disease out.