Personally, I’m not totally happy with the map weights in MCC. For example I think Reach BTB is weighted too heavily towards DLC maps and not enough towards Forge World maps. So I would like to see the map weights get changed.
But instead of trying to figure out the “optimal” way to weight the maps, why not have the weights change over time, on a monthly basis? I think this would be a great way to ensure that players get to experience a wide variety of maps, while still maintaining some consistency. You could even have themed months, for example one month you could favor launch maps, while the next month favors DLC maps or Forge maps. I think this would be really cool, and it would add some much appreciated variety for long term players.