You don't want do to that? Good, don't. Make it so that I can, if I have to tick a box somewhere hidden in Apple's labyrinthine and undiscoverable Settings app.
Of course, we already know the answer why I can't do what I want with my phone, because it isn't my phone, is it, Apple continues to think of it as theirs and they simply grudgingly rent it to you for awhile all the while treating you the user as the enemy.