When you frequent forums a lot you tend to get the impression that it's the majority but in reality it really isn't. A bit after the S6/Edge release I asked some of my friends who work as sales people at major carriers or Best Buy whether or not the lack of SD or removable battery affected their sales of the phone. All of them told me no. In fact, many of them said the average consumer didn't even know what a microSD was. Most of the buyers bought it because it looked nice or ended up buying an iPhone. It just doesn't seem like the average consumer could care less about microSD or removable batteries as long as the phone works as advertised, looks cool, or is an iphone. That's the sad truth about the average Joe consumer and probably why Samsung decided to remove them.
The problem with looking at sales figures is that those figures are affected by MANY different factors. The fact that people were blaming the lack of removable battery and lack of microSD on lower S6/Edge sales for example. Probably one of the main causes of Samsung's lowered sales was not because of an SD slot or removable battery but most probably because of Apple releasing the iphone 6/6+, and trying to lure iphone people just isn't going to work. Practically every android smartphone vendor didn't meet sales estimates last quarter. Apple beat expectations even though the iphone 6/6+ was released last year and they don't use SD slots or removable batteries.
I agree that Samsung taking the strategy to be more like Apple isn't a good idea or will work out. At the same time though I can understand why they switched strategies. They needed to differentiate themselves better. Not to steal customers away from Apple (since that definitely won't work) but from others in the Android market. Will the Note 5/Edge+ be the one to do so? Probably not because it's basically just a bigger S6. Is it because it doesn't have an SD card or removable battery? Once again probably not. As for me, I do like SD cards and removable batteries so I'll stick with my Note 4 and wait until LG releases the G4 Pro.
TLDR: It's all Apple's fault