BOM may have references to other shows, but it uses them (and the form of a traditional Broadway musical) to tell a very untraditional and rather insightful story about the impulse for faith and the need for a religious community to inspire hope.
SR!, the critics who would argue tongue-in-cheek about it being "original" since it plainly is by any rational definition, would argue that SR!'s references overwhelm any semblance of any original idea to the point that there's no there there and it amounts to a dizzying number of referencing papered over a wager-thin (if that) concept that is wholly based on the ideas and works of others.
Words don't deserve that kind of malarkey. They're innocent, neutral, precise, standing for this, describing that, meaning the other, so if you look after them you can build bridges across incomprehension and chaos. But when they get their corners knocked off, they're no good anymore…I don't think writers are sacred, but words are. They deserve respect. If you get the right ones in the right order, you can nudge the world a little.