I've had an electric motorcycle for 3 years and it's a habit I've built.
Letting the cells balance is one reason, even when the vehicle doesn't need a charge for reasons of expected range. But the real reason is that the pain of forgetting to charge when I really needed to, is much greater than the few seconds it takes to maintain my habit of plugging in every time I return to the garage.
Plug it in every night if you can. The battery management system will keep the battery pack happy while plugged in, cooling or heating the pack as necessary. If the car is going to be idle for longer than 4 weeks, the recommendation is to drain the battery to 2 or 3 bars (10 or 15 percent) and leave it UN-plugged. Under 4-weeks, leave it plugged in.