NAV is an anonymous coin. That is what is actually known for in the outside world. The fact that NAV has faster transactions than Bitcoin and its other advantages are not really seen as NAVs main features by the outside world. And I guess other coins out there also have faster transactions than Bitcoin. So summarized, NAVs strength is anonimity. Yes, anonimity is nice sometimes. But lets be honest here ... do you really care government knows you bought 2 bananas, 1 apple and an icecream in your local store ? Do you really care if government knows you ordered new pants in an online store ? In case of online stores ... does it really matter if Bitcoin takes 30 minutes to arrive if the delivery of the pants takes 2-5 days (the 30 minutes are actually irrelevant as your order is known immediately when you push PURCHASE button) ? I don't think that most people would have problems with that.
What is the main advantage of an anonymous coin ? To hide what you bought and from who. When are people interested in this: tax avoidance and black markets. The only exception I know is maybe people wanting to hide they bought gold/silver or if they maybe paid for sexual services.
I am not saying that I don't value privacy of my purchases, even if I buy pineapples and yoghurt. But I doubt many people really care a lot about that. Merchants will probably prefer it to hide they sold something so they don't need to pay taxes on it. I think that if you really believe that NAV will mainly be used for honest activities than I think you are not being realistic. Why would I need any other crypto other than Bitcoin to buy groceries ? People are using Bitcoin right now to buy coffee in a cafe despite Bitcoins transaction taking 30 minutes. If I read your reply I have the feeling you want to compete against Bitcoin and win the fight. But I don't think that is the right path to go. Overtaking Bitcoin is almost impossible.
I am not claiming I am right and I am always open to change my mind about this. But then I need strong arguments which at this moment I didn't come up with one yet.
It's not only to hide from governments; it's to hide from neighbours, insurers, workmates. Do you want your flight to cost more because the airline can see you make more money?
Do you want your insurer to know what you buy and who you associate with? (Facebook stopped an insurance company from giving discounts for revealing one's Facebook account recently, but probably only because that's a service they want companies to pay Facebook for -- They have data scientists working on it and patents for it.)
Do you want potential employers to know how much you make in your present job? Do you want your present employer to see how much you made in your previous jobs?
Seems like it's something that would put one at a disadvantage in any kind of negotiation.