You can run all conduits. My 1947 house was done with all 1/2" metal conduits originally, except for the phone which was done with what looks like oil soaked cloth covered romex.

The conduits I've added are all 1" PVC, but I have a convenient crawl space to run them in. Those conduits used to have coax in them, now have cat 5.

Probably 1/2" conduits are big enough and easier to route.