I have been playing computer games for over 30 years - it has always been about competition. Competing with the computer, with myself and with others. It seems you are most interested in being efficient, which I referred to earlier, and that's fine, it's one of the ways Settlers set itself up, so they have to deal with the consequences. Clearly this matter aggravates you a lot, but a straw poll of my guild suggests it's low down on people's priority list. Each to their own.
The point of picking the two most valuable adventures to play was to point out how explorers can be very valuable and therefore a parallel to the bookbinder. You poured scorn on the suggestion that the two were comparable, but they clearly are. Take a moment to reconsider why you aren't at all bothered by downtime for your explorers, but you are so wound up by downtime for the bookbinder. If you're bothered by one, you ought to be bothered by the other. It's all about perspective.