I agree. As a fellow musical lover (I'm posting from the intermission of a touring Broadway show) the writers clearly understand what the music in musicals is meant to represent. La'an's and Uhura's solo numbers definitely gave some emotional insight into both characters that I feel benefited the show beyond just being decent musical numbers.
The autotune was painful in a few moments for certain actors but hey, they're not professional singers, and I would have loved a bigger dance number, but I know that's pushing it.