That would be the trade off that someone getting more than 16 would have to accept. I am hoping that the work that Panasonic and Tesla/Toyota are doing may be able to offset some of this, between their work on refining LiCo's and Apple's willingness to adopt new changes early on!
Is using both desktop and laptop RAM on the same Apple portable acceptable to their design principles? I don't know.
Is the R&D of making a 32GB model financially beneficial to Apple at this time? I also don't know but I think the justification of "we wouldn't make enough money doing this" is a
completely respectable response from a private company that, at the end of the day, must pay their employees and shareholders.
Exactly how many people will swallow what would presumably be a big price premium (and reduced battery life, plus potentially more heat) over an already plenty capable machine with 16 GB? Other than one, I don't know.
What I do know is that I like the MacBook Pro, I've come to like the 2016, I think I would prefer to stay with a laptop over a workstation for certain tasks that are occasionally done outside of my home (when I wear a suit instead of pajamas), and my own personal workflow would benefit from a little more during certain peak tasks.
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And I am NOT a "pro user", a TS/SCI/Q-cleared super secret operator, the bright mind of tomorrow, a fancy CEO, the President of a powerful nation, or a divine being. So I'm not trying to say what makes the MacBook Pro pro or unpro as I am not a "pro" beyond using the computer for my profession. I do much of my work in my pajamas with a rabbit sitting in my lap.
Sometimes I'll even do a video conference session where I am wearing a nice shirt and tie, but still pajama bottoms with a rabbit sitting on my lap. I accept that this is not very professional.