Taking on big ideas and future anxiety, the Netflix adaptation of “3 Body Problem” is a sci-fi epic lacking in philosophical heft. Based on a series of seemingly unadaptable novels by Chinese author Liu Cixin, there are grand ambitions at work here, but not enough to propel the series into a “Game of Thrones”-like phenomenon. That last reference is inevitable. Of the show’s three creators, two include “GoT” showrunners David Benioff and D.B. Weiss. They have teamed with Alexander Woo, whose credits include “True Blood,” and together they tackle the project with admirable seriousness and a focu…