It seems like the one you have there would be great if you play only Seaside and/or Prosperity. But with 13 expansions and 376 different Kingdom Cards, there are going to be a lot more games that don't have Island/Pirate Ship/Native Village than games that do, which makes those spaces on the mat take up a lot of unneeded space.
It would be very difficult to make one that works for any random setup, because different setups may need very different mats, etc. That one does look really nice, though!