We have been learning about these engineered i-joists over the last several years and we know about the dangers of falling through floors that seem to be intact.
As you can see, these building components are also being used for roofing systems. We are already careful because of the history of light-weight truss systems, but I can see the same problem with these i-joists.
Just remember, the houses are getting bigger and lighter and they are burning faster. Situational awareness and a strong understanding of the risk vs. benefit theory is a must.
Keep you and your people safe and get to know what is being built in your area.