I think you‘re being a bit dramatic. I’ve used racks/rails like this for over 30 years. Including similar loads. No problems. Ever.Yes, it is annoying that provisioning for roof racks seems to be more decorative than functional. Flush rails are so much less useful than raised rails, so it is strange that when car companies bother to put rails on, they use the much less useful flush rails.
You just need to adjust your tie down techniques.