To a degree. Some of us still have to manage devices from an enterprise standpoint, which the last working version of iTunes helps, especially as it has the App Store. Personally, since I bought my children a S/D iPhone 6s each, managing their apps through that and family sharing and it asking for permission from me to download anything is a lot easier than letting them have unfettered access to everything iCloud based.
That said, I'll back up their devices with iTunes, and update iOS either OTA or through my Mac for them.
That said as well, has anyone had any issues getting to the full IPSW for 16.0.3? I'm just getting a blank page when going to the link provided by Apple.
BL.