I suspect if you were to ask your question about liveability of a GB 32 in Japan or Europe, you'd definitely get more yes's. Americans and Canadians definitely feel like they need more room than they really need.
Home is a place in your head and if you are comfortable and like your home, then you have all you need:
Here is a video a woman (Canadian) who has been living in a Van for two years:
Here is another woman living in her Ford Tansit:
And another vid of a woman living in her van with her dog:
For many parts of the world, you have lots of room, for other parts of the world.... "what are you thinking???"
So if the boat you are looking at is similar to this GB 32, I could easily live in it full time. But my wife and I have lived in a 17 foot travel trailer with my son, a cat and a dog. Then further back, my wife and lived in a 21 foot trailer full time, then 35 foot fifth wheel, and finally a 32 foot Winnebago. And I enjoyed all of them.
But I have found I can quite comfortably live in small spaces. Many middle class North Americans can't. So its up to you to figure out your own personal comfy home parameters.