Until people find the middle ground or convince the other side, being stalled is not the worst solution. Dictatorship, civil war, and most other alternatives are worst than stalling legislation.
Take carbon tax as an example. I myself believe human action is destroying the environment and I want to reverse it. But I do not think carbon tax is the way, and I know many moderates on the same position as I am. How about removing all incentives first before imposing punishment? How about triple the nuclear plants, that are safer than never with newer tech, and make it impossible financially to justify carbon based electricity generation? There are dozens of ways to take the first steps without punishing people and getting more money in the government hands. Carbon tax is just shifting money from one hand to the other, and other bad actors will do something bad with it. I prefer to fix this with less money and less power to governments. And there you go. Better stalled than move forward in the wrong direction.
The Senate allows a minority to stop the majority from tweaking the laws in an iterative process, and holds the society back from doing things that require laws, like carbon tax or cap n trade, or even fixing clear bugs in ACA. We don’t have much internet relevant laws passed in the last twenty years, yet the internet and its conflicts have changed quite a lot since Napster. We can’t change the law to let people rebuild flood destroyed buildings on higher ground. All we do is tweak the budget numbers and appoint judges. It makes prospective solutions extremely tilted compared to even a good compromise of a law.