I love playing adventures in settings made of multiple genres, particular combining fantasy and sci-fi together with possible other genres such as post apocalyptic and the dark side rules.
Some adventures was difficulty due to the rules being rather different to get them to integrate.
By designing Starfinder to also be an extension of Pathfinder would ease the process of creating complex genre settings and adventures. Would allow the use of many existing third party content with Starfinder, with minor or no adjustments needed. The Technology Guide was definitely the first step to achieving the goal of fantasy sci-fi adventures, and Starfinder should continue the process of extending Pathfinder, if even creating stand alone core rule books for the setting.
I more concerned of the integration aspects, that what the aliens and monsters would be, or the extensive technologies that would be available until the Gravity Age (final advancement Age).