I don’t want basic economy because it means my kids will end up scattered across the airplane instead of sitting with me. So I always have to upgrade to the “normal economy” seats. I’m willing to bet a large chunk of money that a huge fraction of the airlines’ customers do the same “upgrade” because their sites are more or less built around the idea of funneling people into it. Yet on Google Flights there’s no easy option to specify that I want this popular product: the only options are Economy, Premium Economy (a very different product), Business and First.