Earlier quoted context omitted.
What is the reason for writing always in the same direction? I don't ask this as a joke: is there seriously a cognitive advantage to having to pass your eye all the way back to the beginning of the next line (whether you read right-left, left-right or top-bottom) vs immediately dropping down and continue reading? On the other hand I spent a lot of time in high school and university reading pictures of boustrophedon g…
Double the characters to recognize; double the heuristics to internalize for rapid reading. No idea what the relative cost of those are but I'd wager it exceeds the mechanical cost of scanning back to the "front" of the line...
So it's definitely not twice as much work, I'd say it's not more work at all, you basically just don't worry about the chirality and that's it.