Yep, rip a 8/4 oak plank in under a minute or get a flat side on the same if rough sawn.
For me it is breaking down the stock to manageable sizes. I could do the same with a sharp rip saw and hand plane but I'd be at it for many hours and still have to correct for my ineptness following a line and flattening a twist or other surface issue.
I have no doubt that with the skills, one could do it by hand but given only maybe 10 hours a week to work, I need to be as efficient in my time as possible.