Another strange thing to me is the ridiculous number of bedrooms in new single family homes, and the assumption that more is better.

Sites like Zillow don't even let you put an upper limit when searching. Agents can't believe you don't want a bigger place. I don't mean cheaper, I mean I don't want all those rooms and stairs. In my area, you perversely have to go to the ultra-luxe range of the market to get a high quality 2-3 bedroom single family home, while 5 bedroom new constructions are a dime a dozen. That makes no sense.