They have no idea nor care that their phone is 64Bit either, but it is. It's a poor argument IMO because I couldn't give a damn what light users think or do. If the most expensive smartphone on the market is dumbed down and aimed at technophobes then I should probably think about getting something else.
Regarding the 6S+ possibly having more RAM than the 4.7" version then the short answer is that it needs it. The 6+ is massively underspecced when it comes to RAM whilst the 4.7" iPhone 6 just about gets away with it if you're a general user who doesn't care about multitasking.
No one asked if you cared, I was just stating fact.