They’re already used extensively. Anywhere there’s a wooden beam over 2” x 6”, not to mention plywood/chipboard/etc. old growth wood, which you’d need to make a

They’re already used extensively. Anywhere there’s a wooden beam over 2” x 6”, not to mention plywood/chipboard/etc. old growth wood, which you’d need to make a solid beam of any bigger dimension, is waaay too expensive (not to mention less reliable/predictable) these days.