The convenience of hitting the back button and looking at other pages about them. Booking is the first page I want to check but not the only one. Sometimes I won't hit back, but my browsing habits are informed by being able to hit back.
You're allowed to have your workflow, but I'll add my n=1 that I want the exact opposite behavior, and I suspect I'm in the majority there
You might be arguing for what people think they want if they're polled.
If Google always prioritized official websites, dollars to donuts, people wouldn't like it.