Why Do Apple Allow Iphoto Web Journals On iOS But Not OSX?

Iphoto for ipad or iphone allow web journals to be stored in icloud and presented in a web browser

why does the mac version of iphoto not allow this, and does anybody know if this may be a feature they add to the next update? is this a requested feature they will consider?

mac Iphoto only seems to allow the purchase of physical printed journals, not web journals