Its not an oversight, they're marketing the MBP towards consumers and the clear majority of them don't need more then 16GB. The consumer demographic is a lot bigger then the what was historically Apple's core customer base, the creative professional, and they're building a machine based on that larger group. Initial reports seem to indicate apple is selling these very well.
There's the technical reasons why they didn't go beyond 16gb, i.e., lack of low powered ram/chipsets would have adversely affected battery life. While there may have been work arounds, why add that in, when their focus is on the consumer?
Finally my mini rant about "Pros" We've been hearing this quite a lot but really what is it? People throw this word around left and right without really defining it. I consider myself a prof because I use my computer for work, but clearly some people won't because I don't work in the creative job sector.
People say the MBP is no longer a pro machine because it lacks some feature and that's just not true. It may not be a good fit for a given usage, but that doesn't mean its not good for all professionals, i.e., people who work and use a laptop
Sure - so, let me elaborate.
A very very large sector of creative professionals from a visual standpoint and video editing standpoint work with MacOS. The Mac Pro is all but dead with no indication of it coming back. It's been years. The MacbookPro is the next viable option.
If you work with high fidelity images or 4K video files and you're running a pretty standard multi-tasking workflow in a professional environment you're probably using a good amount of system RAM. Let's say 10-12GB possibly. Cool - but in 2-3 years, it won't be so cool, it'll be an issue. For some users, it already is.
For me specifically, I'm a software engineer. A large community of software engineers work on MacOS, we prefer a Unix based OS and Mac is traditionally a viable solid option.
Removing the function keys on the 15" (or, not even letting it be an option, like it is for the 13", which, is a dual core and certainly not viable) and moreover running a limit of 16gb without user upgradability (this wasn't always the case) severely limits the lifespan for developers. No big deal, right? Except.. many of the awesome tools you use today, and probably many of the programs you use are developed by people like me.
Apple has traditionally been a beacon for this community.
As far as technical reason for limiting ram and running DDR3? That's not totally true. Yes - it would have impacted the performance of the battery, but we have windows machines (specifially, XPS15) that does support 32 and frankly the battery life change is negligible.
A Pro laptop is meant for power use. If your professional setting is Office Suite (with the exception of heavy excel use with intricate macros) you are a professional who uses a laptop - you don't quite need a pro-grade laptop.
It is ABSOLUTELY an oversight because - by marketing the 'Pro' laptop at standard consumers (previously, years ago, just the macbook line would have done this) they've completely nudged out the creative and engineering professionals who are (especially corporate-wise) some of their larger customers.
Frankly, those people don't have a tangible option on MacOS now. That's pretty unfortunate. I think you're misinformed or ignorant if you really believe what you typed out.
EDIT:
TL;DR
Pro Laptops are meant to offer tools for advanced computing professionals - that's always been their draw. The average US working Professional needs a basic computer for basic office tasks and email. They are not (previously) a candidate for a $4,000 dollar laptop.
Creative and technical professionals who require heavy spec machines have been left out in the cold because frankly, this machine is not offering any heavy specs.
[doublepost=1480695829][/doublepost]And - for what it's worth - I work on a 2015 Macbook Pro. I will continue to for a little while. From a benchmark standpoint, (bare in mind, the 2015 MBP performance wise was not really an upgrade from the 2013 era even..) the brand new MBP doesn't offer any real advantage as far as horsepower.
If apple upgrades the next interation to include up to 32GB RAM.. I'm sure my company will continue to provide us with Macs. If not, like most companies, we'll end up with weaker build quality, and bloatware on a Lenovo machine.. but hey, at least it'll be able to provide the specs for us.
What does that mean for apple users? Less dev support, less solid applications, and more support for windows/android.
GG apple... GG