Unless you have sit in on a meeting how would you know? I would "Guess" the complete opposite. Designing soldered in memory, and non replaceable hard drives is a great way to add revenue. I am sure they discussed it explicitly.
I am sure that design requires adjustments to the type of parts used, batteries, etc., but still I dont think anything is done on a corporate level at Apple by chance or with good will towards the end user.
Well like I said no one in these forums "knows" but..it's common sense that the MacBook Pro 2016 wouldn't be so thin if it used replaceable components. There's only so much space and the priority isn't customer upgrades, and even though I like being able to upgrade my own laptop, I rather it be lighter, thinner and sexier. Bottom line is if someone doesn't value that, they should get a PC.