Having built single family houses before I can tell you that architects consider only the choices they know. That is why were I live there are 1000 stick framed houses for every one built with something like SIP (structural insulated panels), or ICE (insulated concrete block) even though the others are similar cost to build with overall and have some useful advantages for the customer that often would make them a better deal for the homeowner long term.

This also means there are 100 builders in my area who only build stick frame houses and won't even talk to you if you want something else and only 1 or 2 who will even think about those other options. (they do compete with the other builders so costs are not unreasonable)