It’s not at all clear this is a problem. If all the winners are the closest to the centroid, then you will have statistically about the same overall ideological center within the group regardless of whether a proportionality is used. You might expect the lack of different perspectives to cause a problem, but a bunch of centrists can solicit expertise from multiple perspectives. Which makes sense since they are vying for every vote. Not to mention that a body of centrists will tend to get along a lot better than a bunch of quarreling extremists like American leftists and Trumpists.
But as was noted, there are things like sequential proportional approval voting if you really want PR.
It’s not at all clear this is a problem. If all the winners are the closest to the centroid, then you will have statistically about the same overall ideological center within the group regardless of whether a proportionality is used. You might expect the lack of different perspectives to cause a problem, but a bunch of centrists can solicit expertise from multiple perspectives. Which makes sense since they are vying for every vote. Not to mention that a body of centrists will tend to get along a lot better than a bunch of quarreling extremists like American leftists and Trumpists.
But as was noted, there are things like sequential proportional approval voting if you really want PR.