I am a bigger fan of The Beach Boys, but this is incredibly light in terms of what's actually happen.
Part of me gets it because they are still real people who have to live out their lives. But their stories are so old and long forget that it shouldn't be this clean.
I knew it was trouble immediately when I saw it was produced by Disney. From there you can always tell it's going to be very clean. But too clean.
They don't get into their family drama, how the father Wilson was controlling it all and causing rifts between the members and him. Like others pointed out, no talk about Brian and the state he was in when he was younger using drugs and whatnot.
Just felt like there was more than what most wanted out of this story and the fact people are happy with the little they got is disappointing. They should want more, even if they are uncomfortable with the material, that is their story.