Yes, but they are still clawing back that market share. Because price / performance ratio of 12th gen i5s and i3s is much much better than most available AMD processors, they are able to get away with expensive motherboards. And at least temporarily for now, upgrade options of AM4 are also as limited as 12th gen mobos. One leaker recently leaked that Raptor Lake CPUs will be supported by Alder Lake motherboards - can't be sure, of course.
But yes, with 11th gen, there was no point for Intel motherboards being so expensive. Just Intel's habit, as we know.