Make global navigation optional for subsites. I can't get rid of the parent navigation with any of the available settings, and it looks like crap. Why don't you provide options instead of pushing your preferences down our throats??
Sean Wallbridge commented
Agreed. Having hub sites only work in modern SharePoint sites does not help companies that have existing SharePoint footprints. We’ve been using a 3rd party tool (https://getnavo.com/sharepoint) to provide global navigation and it works with classic sites and sub sites but I shouldn’t need another application to provide functionality critically needed within a product Microsoft controls.