Why the line gets cut before anything gets broken
Breaking concrete with a hammer doesn't stop where you want it to stop. The crack runs past the mark, the edge you meant to keep spalls, and the slab next to it takes the hit. Most demolition damage is a line that was never cut.
So we cut it first. A sawn line gives the break somewhere to end, and it lets the piece come out in sections you can lift, instead of a pile you have to chase. That's the whole method, and it's the same whether it's a patio in a Huntsville backyard or a slab inside a building.
