Beware the new iTunes if you manage your iOS apps on your Mac. As of version 12.7, they’ve removed the iOS App Store from iTunes. While I applaud the thinning of iTunes, there is no real replacement. Some things become more of a pain. Some things are lost entirely.
To download an app, it must be done on your iDevice, once for each device.
There’s no way to get a list of the apps downloaded but not installed, at least not a convenient list like the Library list that was in iTunes. You can still list the Mobile Applications folder, but I don’t know if it gets kept up to date. There certainly won’t be an easy way to delete an app with the intention of re-installing at some point in the future. You’ll have to remember it and re-download it.
If you have to restore your iDevice, the restore re-downloads all the apps again. I expect that a backup will keep track of installed apps, but may not actually store the apps on your Mac. That means that if an app is pulled from the App Store, you may not be able to re-install. I’m not sure of this but it seems to be what they’re doing.
One thing they did keep was the ability to transfer files directly through iTunes. It’s called File Transfer and is in the left side menu panel for an iDevice.
There are also changes to ringtones.
If you’ve already updated, you can go back if you have a copy of the old iTunes. This is why I always keep at least one old version. There’s a folder in your iTunes folder called Previous iTunes Libraries. In there you’ll find the last version’s library. So you can copy it out and remove the date from the name. You’ll have to delete the new iTunes directly since I don’t think an older iTunes will install over a new one. I did this and I’ve got back the old iTunes and App Store. Now I have to decide how to manage the change because the new iTunes is needed for iOS 11.