This is correct. Wood frame buildings sway and flex during an earthquake. The weight is less important. The problem spots tend to be attachment to the foundatio

This is correct. Wood frame buildings sway and flex during an earthquake. The weight is less important. The problem spots tend to be attachment to the foundation (the building disconnects from the moving ground and starts to skitter around), insufficient beam connections (beams slide off their supporting columns), or support wall collapse. If you live in the Bay Area all of those things are fairly easy to fix - even as a DIY project. Install more concrete anchors in the sill plates, add earthquake rated connections to beams (which were often just toe-nailed), and put plywood on interior garage walls and half height supporting walls which makes those walls much stiffer (old building standards didn't require nearly as much blocking or cross-bracing between studs). As long as a wood stick construction structure stays connected to its foundation and has the smallest bit of strength it can withstand even massive earthquakes without issue.