Improve UI for hub site navigation
The UI for the SharePoint Online hub site/current site menu nav on mobile apps and browsers doesn't make it very clear where the primary nav is. I wonder if the default could be an expanded hub site nav and a better delineation between it and the current site nav in the mobile menu. It basically looks like your hub site link in the mobile menu (collapsed menu items) is a heading for the current site menu items. Also having the menu presentation consistent for Android/iOS apps and mobile browsers would be great (they're currently different).