This all checks out to me. They are talking about flight deck documentation, which means, the guidebook type can be small but not too small to read due to movem

This all checks out to me. They are talking about flight deck documentation, which means, the guidebook type can be small but not too small to read due to movement and perhaps if the reader is in an emotional state. You can imagine reading instructions on Apollo 13 after the increase in Carbon Dioxide just to go through a power down sequence checklist. Floating around, emotional state, perhaps some brain dysfunction due to air composition and lack of sleep. You don't want the type too small.