Let's acknowledge what this technology is all about: Apple providing yet another reason, in the form of big file sizes, for consumers to justify paying the premium upgrade price for flash storage upgrades, and the Apple cloud services they integrate with.
Per Apple's product purchase page for iPhone, there's a "helpful" dialog option entitled "Not sure how much storage to get?" This can help you determine whether you should pay $100 to upgrade from 128GB to 256GB ($100/128GB), $200 to upgrade from 256GB to 512GB ($100/128GB), or $200 to upgrade from 512GB to 1TB ($100/256GB). Of course, Apple would rather have consumers focus on how "great" a deal to upgrade from 512GB to 1TB, rather than focus on how terrible a deal it is to pay $500 extra for an additional 892GB of storage.