Not really. More ram = more power consumption and less battery efficacy, possibly more space/bulk, weight etc. For wut could be negligible gains, if any
Not really.
God...
I wanted to NOT answer this so hard, but I simply MUST because there is so much misinformation here.
More RAM capacity != more power consumption.
More RAM
chips would mean more power consumption, yes, but
Apple could have easily fit 2GB or even 4GB in their A8 SoC with the same number of chips.
Meaning... they could have easily added multiple times more RAM capacity in their SoC without significantly adding to power draw.
Just as an idea... the actual power draw of DDR3L RAM for mobile application is about 36mW/Hr, or 0.036W/Hr.
The iPhone 6 plus has a 2915mAh battery rated at 3.7V, which gives approximately 10.7V.
So even when the RAM is constantly on, it's only consuming about 0.3-0.4% of the battery at any random time.
Assuming your logic of "more RAM means more power consumption" still somehow applies because Apple engineers suck at condensing RAM chips, then the power draw would still be less than 1%, so
the battery life saving would not be significant at all compared to other components.
Also to debunk the second myth: since Apple could use the same number of chips, there would be no extra space needed. And it won't add more weight either. The SoC accounts for a very minuscule portion of the device's weight.
The omission of higher capacity RAM in newer iOS devices is merely because they wanted to improve profit margins as stated. Higher capacity RAM chips need tighter tolerance, so tighter testing procedures and higher part cost would lead to less profit for them.
Plain and simple.
They are still a business in the end.