Ron I would think that newbies feel that way, or to put it another way it looks easy so clean flat work, mess up, find out how hard it can be , leave zebra stripes, chip off a piece of stucco, forget to wipe the windows you got wet and more. Then say this is harder then I thought and either quit or cross over to fleet or gutters or some other form of pressure washing.
I started with flat work knowing that was what I wanted to do, that is pretty much all I do. Sure dumpster pads might include the walls but I consider that part of the job.
Jon