week 16 FF Superbowls has been the norm for years
Right, 16 is the norm and most of my leagues use that. However, my longest running league uses 17 (along with several other different things like distance scoring, etc.) and I don't mind it at all.
For one thing, one more week of ff. Secondly, it adds an
extra factor to account for when drafting, trading, and WWing. A lot of ff sites are geared toward week 16 bowls, so week 17 gives the, dare I say, true shark a slight edge.