Agree with that, for example, there is no need to keep the i3 partially charged, in fact if you are leaving it for any length of time BMW recommend keeping it on charge. Cell balancing is done using the 10% reserve battery capacity which is one reason for the headroom. Also. Lithium batteries have different characteristics to other cells and do not require to be deep cycled to retain full capacity.
Best to take the manufacturer’s advice which should be in the handbook rather than somebody with a different type of vehicle.
Going by other posts they have made, OP appears to own a 24kWh LEAF, Hence my earlier, rather cautious advice to do a little extra work to look after the battery. Unlike the i3 for example there isn't a great deal of reserve capacity, there is no battery cooling, and the earlier LEAFs are famous for rapid rates of degradation just from using it normally if you aren't careful.
With regards to the lithium batteries, correct. You don't need to do that to prevent capacity loss, BUT with the LEAF, I speak from experience of working with a fleet of them that if the cells become unbalanced, you do end up losing range (temporarily) and it seems that giving it a full charge from low SOC to full a couple of times seems to be the only way to help with this in a significant way.
Pretty much any other car and I would have just said not to leave the battery with a very low SOC, and to try charging on AC more than DC.