Yeah, that was my thought exactly. It's an exploration of existentialism, with a focus on absurdism, that simply uses a sci-fi multiverse setting to illustrate its points.

Hell, you can very easily interpret all the multiverse stuff as metaphor that never actually occurred in the primary universe of the movie, and the fundamental plot (re: the existentialist journey and resolution of familial trauma) is still there. To me, it was essentially an absurdist dialogue illustrated through sci-fi, and to that end, I found it to be incredibly clever.