Blechhh. I hate to say it, but that song doubles down on the elements of the show that I loathed at the Public. When you have to step outside of your show's narrative to preach to your audience and explicitly tell everybody what the message of your show is ("Keep marching on," "We did not end injustice and neither will you," "Yes, the world can be changed, cuz we’ve done it before")... then you're not doing the work. Focus on the characters and their journeys. Let them tell their stories and trust the audience to take away your message.
Part of what makes Hamilton such a powerful piece of historical theatre is that it does just that: it focuses on telling the story and allows the audience to digest, process, and then take away the themes and messages from the work. You're never preached at.
Suffs is a fantastic story. Suffs has compelling, interesting characters. It is aggressively obvious without needing to shove it down your audience's throat that a century later, the fight for women's rights continues to be at the forefront of this country. I wish Shaina would trust her own work and her audience.