I'll be honest, as a kid fantasizing about actually living in the Star Wars universe and having epic lightsaber duels and X-Wing dogfights, I always imagined the movie scores playing in the background. I don't know, maybe my Jedi character had his astromech droid programmed as a jukebox or something. The point is, hearing the score wouldn't break the immersion for me, because it's already there in my headcanon even though it would be plainly ridiculous in "reality".
Still, while we can debate the merits and flaws of various budget and design choices, and clearly opening with only half the land ready in order to boost summer and fall revenue backfired spectacularly, I think the biggest mistake Disney made was to build Galaxy's Edge in DL in the first place. It fits so well thematically and physically in DHS, whereas it just doesn't mesh with the themes of DL at all and they had to alter attractions in DL that visitors have long thought of as practically sacred. If they'd just increased the DHS budget by even 1/4 of what they spent on DL's GE instead, and WDI hadn't had to (at least allegedly) alter the DHS plans to accommodate DL's space limitations, they could have done a much better job with this.