Never used a sunshade with my iPhone 6 either but it sure as hell needed it many times in bright sun. In fact in the alps this past summer I could not even see the screen in the midday sun. Just because someone has never used a sunshade does not mean that the screen will not need one on certain days under certain light conditions. Just as when people suggest a phone or say their XXX works great. Do not leave it there... ask them ...Compared to what? Because too many times others take an answer from someone with out even thinking any further of what they are saying. To say that my XXX phone works great and to rely on that alone as a recommendation to buy it is rather foolish, because if you ask me, compared to what, I may well say back to you, ummm compared to nothing, this is the first phone I ever used to fly with, but to me it is great. To other more experienced users, that phone might actually be crap, since they have tried other models and can therefore make an educated and experienced reply to such a question.
Use that as a rule when asking about anything. when you hear that something being used is great, ask them, compared to what, in order to better understand if they are truly speaking from experience to help you out or whether that is their first of what ever it is. There is a big difference, unless of course, you have the specs on that device, as you had on those other phone with more nits. The question is though, at what cost are those other phones compared to the Wunderphone and what is an acceptable brightness for you. Those asking about sunshades might just want an even better experience than the one above who said he has never used a sunshade with the Wunderphone, you just need to ask more question before it is possible to make an informed decision.
