The wisdom of the founding fathers of the U.S. impresses me. They didn't all agree on solutions and they didn't all agree on what was a problem. But together they chewed through a lot of tangly weeds.
Many people think the foundations of the U.S. are outdated and ill-informed of modern society. Most of those people are poor students of history. The U.S. founders were not poor students.
Regarding lobbyists and special interests in politics, the founders were not the least bit ignorant. In the end they settled on a clever mechanism to control them. The answer to special interests is special interests.
It might be argued that some special interests have escaped containment. Big oil is too big? But Biden just sent massive funding into solar and batteries and electric vehicles. Big chemical is too big? Trump gutted EPA? What about Big Pharma? Well, any system is going to have pendulums, and none of them will be perfect. But can they self heal? History suggests the current system is pretty good at that even if any given moment seems a bit off-kilter.
I'm not opposed to exploring other options. But to improve requires a recognition of the weanesses and the strengths of alternatives. Don't be too quick to dismiss the strengths of the current alternative.