well yes, the whole first part of the article before he gives opinion on how to fix it is what he believes (I think rightly so) the root cause is - institutions of power giving more say to those who wish to slow or halt change because they are afraid of what will happen if something they don't like comes to fruition. NIMBYers are probably a good example of this many people here would be familiar with

his suggests reforming institutions to be more responsive to what people want, not minorities who have a vested interest in the status quo

You should read the article to the end where he explicitly disavows that. Or for that matter, the beginning of the article, where he blames progressives for overly-empowering public consultations.

Ezra Klein is indeed left of center by US standards (which means he’s a centrist anywhere else). But he’s making a different point.

I listen to his podcast, and with characteristic understatement, he’s been saying something like “I think the government should be able to enact a program, and have voters judge if it’s a success.” He believes that because of vetocracy that parties now escape accountability as well, they never get to fully implement their idea so they gain electoral success by demonizing or blaming the other group. Klein is saying that he’ll even take a right wing idea (like education vouchers) as long as they get to really do it and own the success or failure. Over time he thinks we’ll get better policies that way & less empty ideological posturing.

(I believe I have fairly characterized Klein’s views here. They are not my own.)

... or remove onerous governmental regulations ...

That is what the author thinks. Not sure this is the actual solution. Outlawing Political Parties is the first step, but that is as improbable as it sounds.