This is by design. Mac apps don't leave tons of trash around like their windows counterparts. Only some config files, always in a standard location. So when you

This is by design. Mac apps don't leave tons of trash around like their windows counterparts. Only some config files, always in a standard location. So when you reinstall, everything just works. Your data lives in iCloud or the documents folder, and is not meant to be deleted when you uninstall.