Bamboo is orthotropic so it’s strong parallel to its fibers but much weaker perpendicular to them whereas wood is adapted to grow in both directions at the expe

Bamboo is orthotropic so it’s strong parallel to its fibers but much weaker perpendicular to them whereas wood is adapted to grow in both directions at the expense of being much slower. When you start adding fasteners (screws, nails, etc) bamboo starts to split along the fibers, becoming brittle and weakening the entire support structure. That’s not to say it’s not strong enough necessarily, but building with bamboo requires different construction techniques and people are still working on validating its safety and updating building codes, which takes decades.