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You want to give the BMS a way to turn the chargers off if it starts overcharging a cell. Otherwise, you can and probably will run into either dead cells, or worse. For me, I had my BMS disconnected once. I overcharged two cells and one literally overheated and shot part of the battery through my rear windshield. This is the kind of stuff that can happen if you don't properly control things.
Since the BMS monitors every cell, its going to be way smarter than the charger, which only sees the total voltage of the entire pack. So, you really want the BMS to be able to control the charger.
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