I'm 6'3". I can't imagine I'd find a 4.5' bed comfortable to sleep in, even with the tailgate down. If it was a 5.5' bed, I think they could swing it better.
Also, it seems that the Maverick was rushed to production to beat the Santa Cruz. Hyundai announced the Santa Cruz long before Ford announced the Maverick, but Ford is beating them to production. Heck, they haven't even announced pricing yet. But in order to sell an unrefined product, Ford has to present it as a DIY dream. They left a weird cubby next to the 8" display (that presumably should have been a 12" display). They added a Ford Integrated Tether System (FITS) mount in only one location with the expectation that people will make their own devices, but also promising that there's more to come. The FlexBed is the same way. Too few tie down points, unless you pay extra for the Lariat trim. Everything about the Maverick just screams "we'll get to that later". So maybe they'll eventually get to a matching tent. Don't get me wrong, I love the Maverick. But it's far from a finished product.