I hadn't even shared yet (not that I share often) that I added a 2023 Yukon XL AT4 to the stable last month, to go along with my 2018 Suburban LS, so this seemed like a good thread to chime in. For me/us, it was a matter of my wife needing/wanting a bigger car, with our 3 kids getting older. She had a 2017 Acura MDX that did fit the 3 car seats across the middle row fairly well, but with our oldest now able to buckle herself, we began exploring captain's chairs options. We looked at the Lincoln Aviator and the Mercedes GLS, but both did not seem to offer enough additional room over the MDX to justify the move, despite the captain's chairs configuration. And she didn't want to go the mini van route. She didn't really want to go as big as an XL, but to her credit, she's always agreed with me that there's almost no reason to go with a standard vs the XL, especially with the intention to use at least part of the 3rd row at all times. With the 3rd row up, the trunk space of a standard Yukon/Tahoe is smaller than the MDX/other comparable mid-size SUVs.
That leaves me and my Suburban which is my utility vehicle, used as much as a truck for camping, hunting, hauling, etc., where we don't want to take my wife's "nice" mom car. Some people, including my wife, may think it's silly to have two of basically the exact same vehicle, but I have plenty of friends that have a pickup truck and their wife drives a Yukon/XL. To me that's no different, and I simply get more utility out of owning a Suburban than a truck for my purposes.