I've seen this done a couple of times, but somebody has to push for it. In standard suburban construction, this will never happen. These developers will cheap

I've seen this done a couple of times, but somebody has to push for it. In standard suburban construction, this will never happen. These developers will cheap out to save $15 on a ventilation fan, they aren't going to run anything extra if people aren't demanding it. To a 1st approximation, nobody (in the buying public) knows or cares.