This shows you how fun, useful and fascinating C++ template meta programming can be but also the dark side as a perfect example of inscrutable code that can be a real pain when you run across this sort of thing in production code with no documentation.
The "bad" is referring to the floppies, not the ad. The ad with the robots at dinner was about buying Maxwell floppies (which were considerably more expensive than no-name floppies) because otherwise the machines might "eat your files". A modern equivalent would be buying a SanDisk SD card over cheaper alternatives.
It also improves the rush hours by enlarging the time range. Most jobs start at 9am or later, so if kids also started at 9am or later the morning rush hour (for traffic but also public transportation) would be even worse.
School ends at 3pm so that the teachers, who work a 9-5 like you, get two hours after class to grade homework and prepare lessons for the next school day.
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