Should you use your turn signal in the turn lane when it's already implied? If yes, what about a two lane when you are in the outside lane? Did you know when you turn you are supposed to go into the closest lane and then change lanes again as opposed to driving through the close lane?

My point is web developers will do whatever they want. Technically you should use www for your website. But if your domain is known for being a website the www is implied and you could make an argument for leaving it out. But no one cares. This isn't linux where you can force users to follow obscure rules to get your software to work. You simply just won't get that traffic. And that, is justice!

So we all know the answer already. Redirect https:// to https://www or vice versa depending upon on your inclination.