My own observation is that we saw major progress with the Renaissance, then the Enlightenment, the Constitution, and so on. Progress slowed around a hundred years ago. From around 1920-1970, we had progress on issues of representation, race, and gender, but otherwise, political behavior gradually drifted towards the Nash equilibrium.
1970-2020, progress mostly stopped, and we've pushed hard to optimizing to game theory. Politicians who now get elected play a near-optimal game, and playing this game is overt.
To make progress, we'd need significant reform of the system.
I would argue, though, that a statement like "money in politics is a big problem on both sides. To be fair, it’s been a big problem in all of politics throughout all recorded history" is very reductionist.
For most of history, it wasn't so much money as military might. If I had money and you had military, soon you'd have both. Money was a component of buying military, but it was just one component (see Rome v Carthage for an example, or Athens v Sparta).
I'd much rather be controlled by someone corrupted by money than by a corrupt warlord where I'm a serf. Democracy is a big step up. We just need another step up right now... and pretending we don't is actively harmful.