At this point, the MKs are not responsible to the voters, but to the parties and where they are placed on the list. Geographic representation would make them responsible to specific voters.
I happen to disagree.
If I live in an area that is heavily Sephardi, Shas would win. They don’t represent me.
With the current system, Yahadut HaTorah is responsible to the Ashkenazi Charedim. ALL the Ashkenazi Charedim–not just the ones in a particular geographic location that is heavily Ashkenazi Charedi.