I am always loudly opposing any changes that go too much towards homogenizing and removing liberties from players even at the expense of server owners running something shitty like one map 24/7. Enforcing a rotation would hurt playing custom games and running servers how people want.
MB2 to me has become a celebration of player liberty.
All other games I play are so optimized and the gameplay experiences are all standardized. It's fucking boring. You get the same game every time. Your opponents and teammates are at your level due to matchmaking. Your map will be picked from this small map pool. Everybody's watched the latest vids from esports tournament X and think they know something about the meta, so the strats you see will be the same ol' day in and day out. Your player interaction will be limited to 4 emotes because otherwise you'll possibly call someone's mom gay. The only time you will feel alive is a new patch that fucks up with people's precious meta strats, forcing them to explore and enjoy all the aspects of the game.
Hopping on a Movie Battles server is amazing because of its freedom. Sure, I'll meet people who don't like me and call me an asshole. I'll hate the server I hopped on because it has some shitty !spin event and the admin is riding around the server with a mutant rancor. It's still better than not giving people the tools to have fun. Sometimes fun has to be had the expense of others' enjoyment so other people get the most out of the game. Players get to choose what they want to play.
I believe player liberty is one of the highest values of this game too. It's one of the greatest elements of this mod that have made me stay. I was always astounded at how many strange and unconventional tactics I could find that people weren't expecting, and just how many ways there were to play the different maps and different classes on them. It used to be like this all the time, and I'm betting this is the game you remember too.
However, I don't get to experience this anymore. It's not due to lack of desire, but both lack of opportunity and the comparative cost required to create opportunity. My experience in MB2 has become homogenized already - either I play the same few maps, wait for the stars to align to see other maps and servers being played while I also have time to play them, or try to take part in few-and-far-between events that might only come once or twice in a year, if at all. There's little to no variety ever, and regardless of my desire, the actions I take, or the people I play with, nothing seems to change.
In this case, the spirit of this mod is no longer to celebrate player liberty or to experience any degree of freedom. Rather, the experience I have just about every time I jump in the game is people "playing it safe" by running the same maps on the same servers year in and year out, with no change. This doesn't match either of our ideals of this mod, not in the least bit. I've put in my hours already by joining alternative clans, making new maps and FAs, and populating non-monomap servers. I'm tired of this losing battle. The amount of effort it takes to combat these monomap servers and clans that run them by playing alternatives is simply too much compared to the cost it takes them to remain popular just by existing. I don't feel like I have any choices anymore when I play this game. The spirit of player choice and freedom has died for me thanks to the supremacy of this "play it safe" tactic for running servers edging out all other options.
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I'd also be careful when conflating clans with players in regards to player freedom. Clans are not atomized individuals, but rather more centralized and organized groups of people who share similar ideas for how the game should be played. Clans are just how these games manage to survive by making communities that act as catalysts for the rest of the playerbase. Ultimately they're a great thing, and one of the only reasons why these games have survived for so long, but clans can also be detrimental if they're influential enough to dictate how the game is played on a larger scale to the community without them having much say in the matter. It's important to remember this.