FoY is completely useless for capital, since it can't be worked and waste a hex. You're much better off to found first expo close to it. Krakatoa is pretty much hit or miss, most of the time it's in the middle of ocean and you can't really work it either. Even if you can work it, you need a large enough city to offset lack of food.
Im not sure how that makes FoY useless for the cap?
You are almost never going to be working every tile in your city radius anyways especially once you get specialists running.
early this can mean the ability to trade your last copy of a lux for some much needed gpt without crushing your happiness.
Seems to me not having to work the tile to get the bonus like other NWs is a pro not a con.
You can easily work krakatoa with a 4-5 pop city though i agree that the likelihood of it ever spawning in a useful place is slim to none.but this whole thread is a big what if.....