Steve,
We can use flex conduit (greenfield) mostly 3/8 to fish down walls. They don't expect us to stick EMT thru a finished wall or cut open drywall to add a few things. Same thing with adding remodel cans or drop cieling lights. They like to see it shorter and with a ground wire.
Single family and town homes are allways wood. A lot of comercial is metal. I have not been on one but I see some single building restraunts, banks, offices with a wood structure. All the big jobs are metal. I think there is no across the board rule.
Things seem slow now. If EMT was not required it would put a people of people out of work. Maybe some EC out of business and lower overall pay.
