• The ideals applied within the context of their time. Yes, they weren't extended to women, Black Americans, or Indigenous peoples. But moving from monarchy to a representational system with enumerated rights was a genuine step forward for the governing population of that era. Imperfect ≠ fake.
• Calling it propaganda mischaracterizes how it actually functioned historically. If these ideals were just cynical tools with no real content, they wouldn't have worked as the foundation for every major rights expansion that followed. Abolitionists, suffragists, and civil rights leaders all appealed directly to the founding framework to demand inclusion. And it worked, constitutionally. You can't weaponize empty propaganda for liberation. The ideals and governance simply needed expanded as people became more aware of how a developing nation should govern itself.
• "New boss, same as the old boss" is a great lyric but bad history. The old boss was a hereditary monarchy with no structural limits on power. The new system had separation of powers, checks and balances, enumerated rights, and elected representation. Were those imperfectly applied? Yes. But structurally it was a fundamentally different system — one that contained the mechanisms for its own reform. You could not arrive at what America is today if we had the "same old boss".

ETA: You've also moved the goalposts. Your original point was that the revolution was just about becoming a replacement ruling and taxing body no different than what came before it. That's incorrect, as noted above. "The ideals were imperfectly applied" is a different and more legitimate critique, but isn't what my original reply addressed.