COcheesehead
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
I get wider (for wheelchairs and gurneys), but why taller? I think you can still easily find a replacement door that is wider than typical, but I bet you'd run into trouble if it's higher.
We have tall doors in our current house. I am not sure of a performance advantage, but they change the look especially if you have higher ceilings. It makes the interior appear a bit grander.