Dumb question on battery charging

I don't want to die wondering so I'll ask a dumb question.

For 45 years whenever I have had to charge a battery I have disconnected the car's battery leads before connecting up the battery charger. Why is it necessary??? Why can't I just connect the battery charger to the car battery c/w all the car leads and thereby not having to reset the clock, Bluetooth and radio security etc.

Paul
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