As far as I can see, unless you have a huge space, island probably needs to hold either sink or hob, and if you go sink you then end up with a central display for all your dirty dishes.
Hob means ducting is difficult but if you can solve that, the room probably works better, no?
For sink you've got issues with drains and can be a pain to pipe.
For the hob you can those extractors that come top from the unit but again im not a huge fan unless the island is really big for sticking stuff around it.
How come?
As far as I can see, unless you have a huge space, island probably needs to hold either sink or hob, and if you go sink you then end up with a central display for all your dirty dishes.
Hob means ducting is difficult but if you can solve that, the room probably works better, no?