Most CUVs (or urban SUVs) don't really have as much cargo space as a combi. They are based on the platform of the "regular" sibling (sedan) but with the bigger wheels and axles taking up some of the interior space. The higher driving position comes at a price.

To put it in context, a VW Golf Combi or Peugeot 308 SW have 10+% more cargo space in a package that's slightly longer and narrower than equivalent CUVs like Skoda Karoq or Peugeot 3008 (2 of the roomiest CUVs out there). Whether you find width to be a bigger problem than length when navigating depends on where you live and how you drive. But the choice combi vs. CUV mostly comes mostly to image.