pre-sliced bread is almost universal and I am reasonably certain are done by machines. Maybe if I had to do it myself I would be more impressed by having pre-sliced bread.
Yes, pre-sliced bread is done by machines with a lot of blades, kind of like a multi saw bandsaw. Growing up I sometimes used a rotary bread slicer which is much like the slicer they use to slice ham at the deli - it was hand operated. I also had to cut bread with a bread knife, it it's extremely hard to get any slice thinner than a half ans inch, and an inch thick was very common, also, cutting tended to squash the bread a bit, unless it was stale. Slicing bread isn't easy, but it varies with the size and the shape. A three inch high by four inch wide loaf is a lot easier to slice than a four inch by four inch load or a five inch high loaf.