David, do you mean Mechanics Companion by Peter Nicholson or some other book?
I have bought some 3m long, 30 - 60 cm wide and 50 mm thick boards of beech with live edges, that I would like to make a workbench from. My workbench will be 2.2 m long and the rest will be used for legs.Top and legs will be 12 cm thick (5"). I need to make parallel boards out of those big boards and there is no way I would be willing to rip saw them by hand. So I will use a circular saw that I have. Then I will need to flatten the first face and edge by hand. so I need to plane 12-13 boards for top lamination that will be 2.2m long, 12 cm wide and 5 cm thick . Then I will probably send them through a thickness planer. This is why I asked the question how to plane long boards. I wanted a light wooden plane for coarse work, because there will be a lot of planing involved. It is not just the usual one 80 cm board that appears in those youtube how to dimension by hand videos.
If I get some experience and speed, then I would sell the thicknesser after some time. I would probably keep the circular saw only, as sometimes it is too much to rip long and thick pieces by hand (or I will buy a band saw in the future).
As in the 18th and 19th century, most people could use no machines. Maybe there were some steam powered planing and cutting machines, but they were not available to general public. That is why those craftsmen had to have some means how to work quickly (either by not planing all the surfaces to the finish level) or some any other shortcuts to build a decent quality furniture in reasonable time.
I want to use as much hand tools as possible, because I have noise and space limitations as well as I am not very concentrated person, so I can make myself an injury with a high spinning blade very easily, so I use power tools only when absolutely necessary.