Koolau
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
I thought of this thread when I saw this article:
Kiss these 10 once-popular home features goodbye - Slide Show - MarketWatch
OK, it's the kitchen, not the bath vanity, but still...
Yup, when we did our kitchen/bath remodel a couple of years ago, we went with single bowl for the bath and double for the kitchen. We really do like the double in the kitchen. It actually cost very little more than a single sink since it is all molded into one piece. We can both work there which is our usual MO.
We have one more bath to redo "someday" and it will be single bowl. Just rarely need to be dueling with tooth brushes or hand soap, so single works for us. When it's not, either of us can use the hall bath or kitchen sink for 99% of what that extra bowl would be used for - and those already are in place. Just personal preference, perhaps, but also, a matter of money priority. We worry very little about resale value. We figure by the time we die or are ready to move to the "home", the baths will need to be redone anyway. Let the next owners decide whether they want to install a double anything.