An issue that will face iOS device users who make use of the iTunes desktop media-management applications is that starting from iTunes 12.7 onwards, they won’t be able to upload iOS apps from their regular computer to their iOS mobile device in a tethered manner using this software. This is in addition to omitting the iOS App Store from the iTunes Store shopfront integrated in iTunes. It is also part of a direction that Apple is enforcing with iOS where you manage your iPhone or iPad from its screen and update its software “over the air”.
Tethering is where you connect a computing device that can normally function alone to another computing device, typically a regular computer, by a wired connection. This is typically to allow a smartphone to be a modem for a regular computer or to transfer data stored on one device to the other device. In this case, it is to transfer iOS apps stored on your regular computer running macOS or Windows to your iPhone, iPad or iPod Touch that you have connected to the computer.
But there are people who use a Mac or Windows regular computer to deploy iOS software to iPhones and iPads. For example, in your business or household, you may want to deploy the same app to multiple iOS devices and want to save bandwidth by caching the app to your regular computer’s hard disk then deploying the same app by tethering each iOS device to your regular computer. As well, some of us may use this as a way to get around a dodgy Internet connection by downloading to a laptop used at a location with known-to-be-good Internet service then deploying where it’s more convenient.
Apple offered a make-do update for iTunes by offering the iTunes 12.6.3 software. This has the feature set associated with iTunes 12.6 including access to the iOS App Store and tethered app deployment for iOS devices. But it has under-hood improvements which allow it to work with iOS devices that are running iOS 11 or newer versions. This is alongside iTunes 12.7 which is focused as a media-management tool and iTunes media storefront.
Personally, I would like to see Apple approach this situation in a better manner for both the Mac OS and Windows operating systems. This would be in the form of a separately-installable “iOS-desktop-manager” program that provides add-on functionality to either the Mac OS operating system for Macintosh computers or to the iTunes Windows port. It would at least provide desktop access to the iOS App Store along with tethered app deployment for iOS devices.
As well, the “iOS-desktop-manager” program could provide device backup and management abilities so you could do things like backup an iPhone or reset a faltering iPod Touch. This is more so where the Wi-Fi or wireless-broadband modem in an iOS device or its network connection can be a point of failure and it isn’t realistic to restore from an iCloud backup if the iOS device’s Wi-Fi is so slow or intermittent. Similarly, using something like your local backup infrastructure such as your NAS or a USB external hard disk of your own means that you aren’t necessarily ceding control of your mobile-created data to others, something that can be of importance when it comes to privacy.