One of the best things that was added to the MCC was the Match Composer. Being able to choose between AR slayer, BR, several different types of objectives, and varying team sizes (FFA, 4v4, 8v8) was a godsend. It was to me quite literally the best matchmaking system in the series’ history.
With Infinite, it’s been incredibly frustrating having to go into preset playlists where the specific game types are chosen for me. Now there’s a tossup between BR starts and AR starts in Team Slayer, while in the MCC I always pick AR starts in the Match Composer. All 4v4 objectives are in Quick Play, but so is Slayer, which feels redundant considering there’s already a 4v4 Slayer playlist. In the MCC, I can pick (or not pick) bomb/flag, asset denial, and zone control.
To add to this, the match composer wasn’t the only thing the MCC did better than Infinite. The MCC was clearly used as a test bed for the battle pass and challenge systems that have been implemented in Infinite, but IMO the MCC pulled off all of those systems better as well.