Up until now, self-publishers who went with Amazon usually used Kindle Direct Publishing (KDP) to produce Kindle books, and Createspace to produce paperbacks.
I did this with Castle Falcon, and it worked quite well.
Now Amazon is pushing an option to produce a paperback from the KDP interface, bypassing Createspace.
I’m quite happy with my Createspace edition, and too many of the KDP paperback features fall under the “not yet” category. That, and I never, ever, use the “beta” version of anything. I think it’s likely that Amazon will eventually phase out Createspace in favor of an integrated e-book/paperback KDP, but I’ll deal with that when the time comes.