> The requirement to have 60/100 votes in the senate makes it almost impossible to pass anything except the most uncontroversial bills.

The filibuster is not enshrined in the Constitution. It's only a Senate rule that could be abolished at any time via a simple majority vote in the Senate. The Senators have chosen not to abolish the filibuster.

> makes it almost impossible to pass anything except the most uncontroversial bills

It's actually worse than this.

Popular bills, like the Dreamers Act, become political footballs. Neither party wants to pass it while the other party is "in power" (in the minds of the electorate), and they want to keep it around as a bargaining chip, campaign promise, etc.

So the bills that get 60 votes aren't just uncontroversial, they're usually not even meaningful to voters.

Even those get spiked for political grandstanding on some off-topic issue.