If thats all our doing you dont need to relearn anything. Theres nothing really different about doing those things, though you do have more options you can do with those things. So saying your making somebody relearn something is very inacurate.
In that case you are spending the money to have a bigger screen and a device that does more things and you will discover those things as you use it.
Windows phones also work very well and to do those simple things you mentioned isnt very hard to learn either. Those are basic functions of any smartphone.
Maybe you dont like a little change and are a same ol, same ol kinda guy. I dont know. I like something different every now and then.
If you can see my sig, you can tell I change phones quite regularly, and I've used every major OS the last couple of years except the new windows 8.1 and Blackberry 10, so no I'm not afraid of change or stick to same ol, same ol.
And I'm also not talking about just switching from iOS to android, which you assumed, I'm talking in general switching from one platform to another, or even switching from one Android skin to another. So if your used to android and decide to try an iPhone, I don't think its fair to tell some one to spend hundreds of dollars and to figure out a new way of doing things and stick with it in the chance they will eventually "get it" and like it better than Android after a month or so, when they can't return it anymore.
Same if someone is used to the workflow on touchwiz. I may hate touchwiz personally, but if someone who was using a GS4 decided to get an M8 and after a couple of days didn't like the way things worked on Sense, such as no multi window, no quick settings on the main notifications bar or even just the layout of the launcher, I'm not going to tell that person to stick with it just because I personally feel Sense is much better, I will give them the work arounds and if they don't feel like having to do those work arounds and learning the nuances, then by all means they should return it and get a GS5 before their return window closes.
Also, as I stated, unless there is a clear advantage to the end user there is no point in relearning or "getting used to" the new system. A larger screen, added options, or even a change to use something new
is a clear advantage if thats what the person wants.
But, if lets say my parents who are using an iPhone got talked into buying an android phone and they don't like it after a couple of days, I'm not going to tell them to stick with it and force them into keeping the phones to give it a chance, I'll tell them to return it and get an iPhone unless there was something about the android phones that they wanted more that's not available on the iPhone, like a larger screen. If that larger screen trumps the iPhone then there will be growing pains getting used to android they will have to learn, but if the larger screen isn't worth it then by all means they should get something they'll be happy with and not "stick with it" in hope that after a couple of months they'll be happy with it.
Also, yes even with those simple things I mentioned there is a nuance with how they work on the different systems. Someone used to android may get confused about why some texts are green and some are blue on iOS. Some one used to the badge system of notifications on iOS may not like how live tiles clear out their notifications after you open the app or that there are no badges on android.Heck, I know some people who like the old style notifications on iOS that interrupt you every time with a pop up. Contacts are shown differently, favorites in your browser are handled differently, on iOS there is a favorites button on the bottom where as on android you have to click the menu button and then select favorites. To us these things are trivial, to others they may not be. So yes, even those simple tasks there is a learning curve, to some it may take 2 seconds to get used to, to others it may bug them for months having to get used to the new way of doing things.