How is the overton window on most issues moving right? The popular viewpoint on most issues is actually moving to the left and has been on that trajectory for almost 15 years. If you take the Democratic Party as a measure of the center, it winds up ideologically being in-line with other centrist parties in the world. It's not right-wing, unlike the GOP which is full on reactionary like Poland's PiS.
I do agree that "meet in the middle" has no meaning in the context of an ideological axis, people actually have specific policy points they believe in. Centrists don't do per-issue ideological/political compass coordinate arithmetic to find the "true center" position that no one likes as some kind of enlightened centrist virtue exercise-this is a strawman. Centrists pick specific popular positions and are pragmatic.
I find that in modern use, "meet in the middle" is used in a disingenuous way to discredit centrism as a valid political worldview, which in turn makes the extremes more acceptable.