Leaf and many modern vehicles charge 12V battery to very optimal state of charge, around 80%.
Problem arises when vehicle is not being used on daily basis.
Some vehicles, like Tesla, have heavy vampire drain. If car software doesn't recharge 12V battery often when
vehicle not in use, 12V battery will take a hit.
13.0V float charging voltage is near ideal for current lead acid batteries that are used DAILY.
For those being slowly discharging for many days when vehicle stationary, 14.4V charging voltage will give a better buffer
for deeper discharge during those idling days. This is why disconnecting current sensor will help.
14.4V is slightly too much for daily "many hour float charge when Li-ion battery is being charged overnight".
Especially in hot weather.
14.4V is fine if vehicle is charging 1-30 hours each week ( up to 4h per day) - it's fine to unplug current sensor.
14.4V is too much if vehicle is charging every day for more than 5 hours
and it's hot - keep the sensor plugged in.
@bitmanEV - thanks for feedback. I was sure then and now it has been confirmed by you
My Leaf is 5 years old and runs on original battery which is in a good state (measured).
For 5 months in a year I have winter and vehicle keeps 14.4V mode on anyway. Can't bypass that.