An extremely popular, successful and entertaining movie is what he created. Thanks for asking.
That sequence "does not explain everything" - in fact, it elaborates on and explains one or two things that aren't of enormous importance except in a completist, OCD kind of way. If anything, the brief passage removed from the "ice cave" scene does more to ease the awkwardness of a couple of plot contrivances than does anything in the "prison planet" scene.
That said - and you're not going to like this - if you're thinking very much about a movie while you're watching it, it's not doing what a movie should do. Ideally a movie of this kind ia an immersive experience, and if it matters you think about it later