I am new to this forum and new as a EV owner, but there a couple of things that you need to consider when it comes to batteries.
With Nickel Cadmium batteries there is an effect that can happen due to the chemistry of the battery. If you keep charging your battery just to a certain level the battery will develop what is usually referred as the "memory effect". This means that your battery will not reach 100% of it capacity, it will "remember" a lower charge level. That is why in the past, with Ni-Cd batteries many manufactures recommended to initially perform a 3 complete charge and discharge cycles to the battery so you can ensure a complete range of usability on a new battery. Eventually as the battery gets old that range will become shorter to the point that it will charge in a very short time but also discharge even faster.
With Lithium-Ion (Li-Ion) or Lithium polymer (Li-Po) battery the chemistry is completely different and the charge/discharge requirements are very different. You don't need to initially cycle your battery. Also Li-Ion batteries can not go all the way down to a complete discharge because then it will be very difficult to get them receive charge again.
As with the other battery chemistry to get them charge to around 80% capacity is not a complex process but to get to the remaining 20% to get to a total of 100% usually involves a more complex process called trickle charging.
Your EV already has software parameters and monitors to provide the security that the specific battery requires and they will manage the charge and discharge cycle in a secure manner so you maximize the usage of your battery. There is a great deal of complexity on managing the chemistry of your battery and that is why everyday there is a lot of research on how to maximize this process.
Yes it is true that is not good to get your battery to a complete discharge, but in reality what is shown to you as complete discharge is just your car systems telling you that you will get to a point where you can compromise the security of your battery so it will disconnect all systems to protect it.
Also the practice of not charging to a 100% is commonly used not only to avoid the long time that trickle charging takes to cover the extra 20% to get to 100% but also to avoid the issues that comes with the inbalance of every individual cell. But in general there is nothing wrong with getting you battery to 100% once in while but manufacturers recommend not to keep the battery at a 100% all the time. Also it is very important that you preform the recommend balance cycles that the car manufacturer recommends because this will ensure the system to supervise the condition of all the cells in the system.
Another recommended practice is to do partial charge/discharge cycles. Using only 20% or 30% of the battery capacity before recharging will extend cycle life considerably. As a general rule, 5 to 10 shallow discharge cycles are equal to one full discharge cycle. Although partial-discharge cycles can number in the thousands, keeping the battery in a fully charged state also shortens battery life.
When you charge a battery the ionization interchange process on the battery causes an exothermic reaction as with many other chemical reactions. So the faster you charge the more temperature increase happens on the battery. The same happens on the discharge cycle. This rise on the temperature can be dangerous and create decay on the internal estructure of the cell. That is why your EV has a cooling system to manage the rise of temperature and avoid damage to the battery. So if you avoid a rapid charge cycle the temperature rise will be minimal and will allow to dissipation process to maintain a safe temperature level. So in general slow charges when possible are better than fast charges for you battery.
That been said, you acquire a car so you can drive around, not to become a nanny for its battery. So enjoy your new car, trust that the manufacturer has put in place systems to secure the charge and discharge cycles so you are not going to compromise the security of the battery. Charge when needed and if possible (and this is a personal view point I am not saying that everybody should do this) avoid fast charges when possible.
