Selling a house

I'd like your opinions please.
My brother is selling what was our family home (former LA property) he has turned the back room into a lovely large kitchen with central island, this leads into a conservatory/dining area and out onto South facing garden. What was the small kitchen is now a separate utility with cupboards, sink and white goods there is a loo leading off.
One agent that came to value says the utility is a waste of space and that he should have knocked through to incorporate the old kitchen into the new one.
I think it works well as it is. .