Apple is eliminating duplicate functionality ... which I did wonder before why there was duplicate functionality in some of Apple's apps. They are rolling it into one app and not two apps. It's nothing more than making it concise and being together in one spot. The very same thing, by the way, happens with developer apps, too, in case you didn't know. I have apps that are either no longer being updated or they have been pulled. In those cases with other developers, I can't say what their reasons are ... but in this case with Apple, it was very obvious to me that Apple had duplicate functionality in two of their apps and that just plainly didn't make any sense. Rolling it into one app makes more sense to me.
And, by the way, I also purchased that program, but it's no big deal to me because I realize that this industry is ALWAYS in transition, and NEVER stays the same. I've seen so many changes since the very first iPhone (which I got on Day One) and it's all been for the good, in the overall picture. This will be the same, as Apple has moved this industry forward like no other company has.
In addition to the above and a little off topic to this thread, Apple has done the same for other programs on the desktop versions, too. Again, you'll NEVER have a static and unchanging market for either the desktops or the iOS devices. I'm glad Apple makes these changes because they've always moved the market in a better direction.