There are four Honda Odysseys and two Toyota Siennas in our extended family. My brothers- and sisters-in-law are now grandparents whose kids and grandkids live near them, and these minivans are put to constant vacation and outing use for their passenger/cargo capacity. I really don't think our use case is as much of an outlier as you assume. This is why the roads where we live are crawling with Tahoes, Suburbans, Expeditions, Escalades, Navigators and other such vehicles that won't even fit in most garages down here.
If Lucid can pull of the same packaging miracle for a 6-7 seat SUV that they did for a 4-5 passenger sedan, there will be little on the market approaching its space-to-size magic . . . and nothing in the EV space.