I'm only up to reading page 13 of 27 pages, but when I started there was only 23 pages to read, so I'm going to pause for a bit to post this dilemma.
Between myself, my wife and my 3 college aged kids (5 of us) we have 6 macs, 6 iPhones, and 5 iPads to use with one iTunes Store account (we each also have an iCloud ID for our personal data). We also have three older iPod Nano and one iPod classic to which we sync music and movies.
We have 5 Macs set up to use iTunes, so we hit the limit of 5 computers, with one for each of us to be able to automatically download content and apps, which we can then sync to as many of our iPhones, iPads, or iPods as we use. But
we are only allowed to have 10 total devices set up to automatically download content or to just download previously purchased content, out of our 16 devices.
So the other 5 slots for downloading previously purchased content are used up by 5 of the 6 iPhones. At this point, all 10 slots are taken. The 6th iPhone and all 5 iPads can ONLY get their data and apps sync'd to them via iTunes, since there are no more slots left for downloading previously purchased content. (However, the 6th iPhone is now on my eldest daughter's personal iCloud account, so she can buy her own content on her phone with her money, and use the family account on her MacBook for everything we bought as a family).
How is this 10 device limit going to work when we can no longer download apps to our Macs to sync them onto our remaining iPhones and iPads anymore?!?!?!
I forgot about this limit and just now went to set up automatic iBook and app downloads on my iPhone and I can't - not enough slots, because my wife started to use her iPad as one of the 10 while on a trip this week. I'll have to de-authorize her iPad in our iTunes account if I want to download anything on my iPhone 7+.