So the GPS Week Number rollover has been all over the news lately. I don't really know anything about GPS, but my first thought upon reading up on this topic was: why use a week-based format in the first place?
It seems like it would have been much more intuitive to use, say, the number of seconds since the GPS epoch. I realize that there's some degree of arbitrariness to all formats, and that there's usually some historical baggage that plays in, but counting weeks seems like a very unusual choice even then.
Is there some practical or historical reason for this design?