Apple pie: peel or not?
Depends on the apple. Apples with softer skins will bake to a more even consistency, but apples with tough skin (the 'shiny' kinds like McIntosh or Red Delicious) tend to get caught in your teeth and throat, and are generally a pain to eat.

If you do make a pie with the skins on, use smaller pieces of apple or slice around the apples to create shorter pieces of peel. These are easier to eat and don't get caught in your mouth as much.