This reminds me of a friend who was an engineer at a toilet paper plant. He designed a computer to watch the pulp thickness just before each roller and compare it to the desired output on the other side, and constantly adjust the roller opening.
As for "far easier", that part reminded me of his tales of a 10 or 20 foot wide continuous stream of new toilet paper rushing by at like 35 mph.
He claimed that once in a while it broke, and the streaming paper coming off some of the rollers at that speed could easily cut your arm off. Besides being a big mess to clean up.
I don't think if a phone assembly line stops suddenly, that people can get sliced up
Just saying....