Little blurb in Shimano's GRX release had me raise an eyebrow:
I'm of two minds with this, design can often enforce good or bad habits but at the same time people are going to behave as they prefer regardless of the design intent. So it seems like more positive braking from the hoods is a good thing and will probably make the grip there more secure as well, but still less secure than riding in the drops. I don't think it's a good idea but people aren't going to start magically riding in the drops just because they're on gravel. Even though they should.
Also I was thinking about this recently as I crashed over the weekend during a gravel rally. Partially by being a dumbass and partially cause I was riding on the hoods and had a large rock wrench the bars out of my hands. Similar to the video in the first post except closer to ~12 miles per hour instead of ~25. Had I been in the drops I would have wobbled and stayed upright.