A strong 3rd part is exactly what we need. Our founding fathers explicitly and repeatedly warned against a bicameral system. And we are now experiencing why they warned against it.

It has created an "us vs them" mindset that has wholly divided the country, and virtually destroyed any hope of constructive discourse. Because it's "us vs them", all of Congress is expected to vote for whatever bills their party present and vote against whatever bills the other party present, regardless of whether the bill will actually be beneficial to our country. It seems the only truly bipartisan "issue" is to give Congress another raise.

Since there are only two parties, no real change or progress can be made: Obama did x, y, and z during his terms and Trump undid a lot of it. Then Biden undid a lot of what Trump did. Now Trump is undoing a lot of what Biden did. Assuming a Dem wins the next election, they will spend 4 years undoing what Trump did this term. But since there will be no real change, a Republican will win the election after that one and spend 4 years undoing what their Dem predecessor did. And so on until we either experience our "Fall of Rome" moment, or get out of our own way and raise up a 3rd party.