I’m in Canada, so I’m concerned about the availability of regional apps through the Application Installer.
Once you installed the aurora app you can install any app from the google play store on /e/. In addition it is easy to request apps from the google play store to the /e/ app store.
That being said, it is still possible that apps don’t work under /e/, if they requrire the google play services and don’t work with the free replacement microG or they have a buggy root cherrer. [LIST] Apps that work or do not work with microG might tell you if your required apps work or not.