Does this exclude a knife? These are all tools that we use. We don't stuff a hide into a machine and have a belt come out the other end. Some people have lots of tools that help speed up the process. Others have a minimal set of tools. Does it matter if I use a paint brush or an airbrush? They can produce practically identical products. If I call my work area a studio, does that move me into a different class than my basement or garage workshop?
If I use a sewing machine versus manual needle and thread, it is hand sewn? If I guide the belt or what ever through the sewing machine, following the stitch line, or I saddle stitch, it is hand sewn? This example will get a lot of feedback. Which side of the bench do you sit on?