Anything above 1.0x harvest rates causes an imbalance (particularly with sieging). Anything above 0.2x exp rates causes an imbalance with individual tiers. DBD on or off can have drastic consequences for the whole server depending on the other settings. There’s a lot of settings that cause imbalances.
Then you have individual opinion. Your balance is trash to someone else. Its best for players to play on the settings they like, not try to conform a single server set to their own needs.