Yes, but certainly not every repair requires replacement of a bga part. The most common are screen, buttons, usb connector, aside from the port, all other are purely mechanical.
Apple doesn't really use through hole parts - the connectors are SMT. I can't see any high volume repair shop using a soldering iron on SMT parts when hot air is so much easier and faster. A hobbyist might, but only because they don't have the hot air rework tools.