This is the whole point of defining metrics which measure the “cost” of such flaws and then simulating.
I am going to follow up from this on Loomio
All are welcome to join. Please ask @Sara_Wolf
IIB and the quota rule are incompatible. In a 9 winner election where the party votes are: 51, 9, 9, 8, 8, 8, 8, the Droop quota rule would require the largest party to receive between 5 and 6 seats, but if you add 4 parties that each receive 7 votes, then the largest party must receive between 3 and 4 seats. Every other party would receive between 0 and 1, but the 7-vote parties would only win seats if a 9 vote or 8 vote party won no seats, which would make those ballots irrelevant.
Edit: meant to reply to @Keith_Edmonds, but I can’t seem to edit which post I am replying to, and Discourse won’t let me delete and repost.