TL;DRAll of this is in service of what Microsoft believes to be the most powerful console of the next generation era. Previously known by its codename of Anaconda (under the Project Scarlett umbrella) the aim has always been to double the outgoing X's prowess with 12 teraflops of compute performance as an internal target. Microsoft sees performance leadership as the crucially important for the core gamer, with Xbox One X - and indeed PS4 Pro - as a successful trial in establishing that committed gamers will pay more for a premium experience.
Xbox Series X GPU eats monsters for breakfast.