I am a person that often finds that dialouge in film, novels, and sound "too perfectly" written. I have seen dozens of art house films with "fantastic" dialouge in which every person behaves in a completely unnatural manner. Yes, it can be very intruiging when done right, but not every conversation needs to be a poem or have deep symbolism in the world of art. Same goes for happy music versus depressing music. Quite some people are quick to call happy/upbeat stuff total cheese and the dark, depressing moments beautiful touching art. But both represent legitimate aspects of the human psychology.
Rock operas (and definitely musicals) can be very literal and blatant in terms of dialouge, but so am I when I am talking to another person. Trying to make another person clear what my intentions/thoughts are is in fact mostly the whole purpose of having any conversation. I can see why people find certain lyrics cringy (for me it is the music player part that always gets me), but in general the way they were written on TA makes sense to me.
Not judging the actual story content here, btw. I agree it goes a bit too silly out of nowhere towards the end. In fact, I wish they went the route of Gabriels singing inspiring people to change their ways, keep the will to fight for their lives etc., instead of his voice functioning as the eagles in Lord of the Rings and have the healing power of Elven magic. (On a sidenote, I thought The Hunger Games with that Hanging Tree song was a great example of using a song symbolising a rebellion).
"Brother, Can You Hear Me?" is a top 3 TA track, and Act 2 is criminally underrated.
This track, along with Road to Revolution and the title track, have grown massively on me over time.