Ungovernable?

Yglesias:

We’re suffering from an incoherent institutional set-up in the senate. You can have a system in which a defeated minority still gets a share of governing authority and participates constructively in the victorious majority’s governing agenda, shaping policy around the margins in ways more to their liking. Or you can have a system in which a defeated minority rejects the majority’s governing agenda out of hand, seeks opening for attack, and hopes that failure on the part of the majority will bring them to power. But right now we have both simultaneously. It’s a system in which the minority benefits if the government fails, and the minority has the power to ensure failure. It’s insane, and it needs to be changed.

I don't understand why the filibuster is so common now, except as a part of polarization.