...because some things no longer fit. In the landscape anyways. Hubby is removing a Bradford Pear tree that was rotting, infected with termites and pretty much came to the end of its life span. You have to give these trees lots of attention and pruning to have them survive. Unmaintained you are lucky if they live 15 years! Please realize this before you plant these fast growers. They can NOT maintain their own weight of limbs on their own.