I'm hoping some of these questions will be answered with the 15 CD box set comes out (possibly to be touched on in the 100 pages of notes to be included). My guess is that the e.v. version was abandoned because it sounded a little too "spacey," something Roddenberry wanted to avoid ("no electronic beep-beep music"). The Steiner orchestration was warmer, more welcoming. With bongos. I like every version of the theme, but I too wish this one stuck around a little longer. As it is, it differentiates the earlier, more stolid Trek from the later Gene Coon more relaxed Trek.