Just tried the pin spanner and it does work well loosening tight fittings, but I wouldn't consider it a replacement for the Hobie tool. There are some hull fittings that have limited access and the length of the pin spanner becomes an issue. The rounded ends aren't an ideal fit either:

It does provide great leverage as Don says and is best used to initially loosen those stubborn fittings.
Locking on a pair of vicegrips makes the Hobie tool much easier to use:

ranger29 wrote:
Does the shape of the 2016 fittings have any particular advantage over the half loop pad eyes on my 2014 TI?
Maybe for straps?
Definitely Don. The larger padeye means you can fit more to it and they also come with a hole so that bungee can be fitted as well. You could have a bungeed hook that clipped back to the padeye.
Interestingly this was one of Roadrunners suggestions in his "Fun with Fittings" post from ages ago. Unfortunately the pics are no longer showing but the thread still makes interesting reading if you want to swap fittings to suit:
viewtopic.php?f=11&t=8922&p=45553