I've had every iPhone released with the exception of the 4 and either of the 6 models. I've also had more Android phones than I can remember, as well as Palm, WebOS, Windows Phone 7 and 8, Windows Mobile and BlackBerry. I love mobile technology plain and simple. That said, let's be realistic... the iPhone can't do multi window and it didn't have good multitasking until iOS 7 and none at all until 6 if I remember correctly, with the exception being background music, which isn't what people in general refer to when they talk about multi tasking to get things done.
While you or I may call multi window a gimmick that doesn't mean it rings true for everyone. Some people truly have incorporated that into their day to day and for them it is key. Just because you don't use something doesn't mean you should discount it and just write it off as a gimmick. I guarantee all of the people that say it's stupid and not needed would change their tune if Apple adds it to iOS.
It isn't crucial to my life, but I'm not gonna lie... I loved using it when I had a Note 3 and I do miss it on all the phones I've had that don't have it. Not so much my 5s because of the screen size, but I always wished I had it on my iPad Mini and it would also fit right in on the 6 Plus I'm strongly considering picking up if I don't give the Note 4 a shot.
There is another feature that is often overlooked when it comes to the Note series and a few other phones seince, like the G3 - hover windows, or whatever they are called officially. I used to use that every single day when I had it. Working in my banking app on the go with a calculator in a smaller window on the screen at all times, for example. No switching back and forth, no losing state or getting logged out of the banking app.
These are good ideas and writing them off as gimmicks because your chosen OS doesn't have them is stupid. Apple should absolutely add those things to the 6 Plus and iPad lines. You can continue writing them off as gimmicks and not use them, but having them doesn't hurt anyone. Also, we all know that if Apple does add them they will likely do them better and with more elegance than anyone before so it is a win for everyone.
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Edit: Yes, I'm on Android right now. This is my s5 that I got after using the 5s for 6 months and deciding I just wanted something different. As I said above, I'm considering the 6 Plus for my next phone so please no "Android fanboy" nonsense. I love cool phones and I personally think all fanboys of any phone should take a long walk off a short pier.