Pre-war stained doors and base moldings

It seems that every one including Robert A.M. Stern at Belnord is going for the painted panel door look rather than stained wood look. Any prewar experts on the board? 1. Were the doors in pre-wars originally painted or stained? 2. What about base molding and door jambs / trims? 3. Is the current general buyer preference painted look for panel doors which is what you are seeing in pre-war like new developments or conversions? Or is it just cost as MDF doors need to be painted. I do see no panel (flat) doors which show wood grain. 4. Primer: What do you see in the pre-war gut Reno’s? Thank you.