>There is a reason people still use shapefiles!

It's weird, I've done an absolute ton of work with random geospatial data from all kinds of sources (see opentrees.org), but when someone asks what format to supply data in, I often suggest Shapefile. There's a kind of rugged simplicity to it, like an old Nokia. It rarely goes wrong in strange ways, everything supports it, and its limitations (especially file size, field name length/casing, geometry mixing etc) tend not to be show-stoppers.

GeoPackage turned into such a complex beast that you have no idea what's going to be inside, I tend to avoid it at all costs.