Hey Jon, Nothing wrong with using rasps and hand tools at all, just more elbow grease needed. I spent my first few years in woodworking doing everything by hand, and still have many of the planes, chisels, and even rasps I used 50 years ago. The old rasps have lost their edge and just don’t cut like a crisp new farriers rasp, but I can’t get myself to part with them.
With that being said…. Shaping a piece of Ebony by hand vs using sanders would be brutal and slow going, and I’d rather sand 36 grit sanding marks out, than those deep gouges of the rasp.
But using power tools to save time takes practice and getting your moves down Pat. You can screw things up much quicker too. You learn pretty quickly when it’s time to use your sanding blocks and leave the damn palm sander alone…. You do nice work….