I'm a non-IT, non-graphic design professional. I need a laptop because an iPad is insufficient for some of my mobile work. I also want a backup for my desktop Mac for redundancy. I want to stay in the Apple ecosystem because I like iOS and macOS - very efficient software infrastructure for my work. The new 2016 13" touch bar MacBook Pro is the kind of device I would like to have, but the price and dongles issue has given me pause and I don't need a touch bar. I am uncomfortably thinking that I might have to bite the bullet. Wish the decision was easier.
Both valid concerns, although at least you are in the 'sweet spot' for the latest lineup, meaning you don't need/strongly want more RAM, and don't 'need' the quad core computing power or screen real estate of the 15" models. Consider your usage - you may be well served by either a refurb 2015, the non-touch new 13" or just go for it with the touch strip. Considering you won't have the magic toolbar on your Mac Pro, the prior two may fit best.
Consider what you
really plug into when portable, as in your case it seems like you have the desktop Mac as primary - find a multi-breakout for USB-C and it may not be nearly as bad as you're thinking.
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For professionals like me.
I organize and manage a team of professional photographers, graphic designers, video production team and motion graphics artists. I have meetings an hour or two away and need a portable version of my iMac that can handle as much as possible on the go. It needs to integrate seemlessly into the entire rest of the MAC office with shared calendars, Logic, Numbers files, fcp-x, in design, photoshop and DaVinci files synced via Dropbox.
So when my animator tells me on Slack he just exported a new version of a company logo for a commercial, i open Dropbox, watch it and then FaceTime him with notes on some tweaks.
When one of my graphic designers uploads a PDF to Dropbox and slack and asks the team's creative input on the cover photo for a brochure. They all weigh in and decide my photographer needs to go shoot something. So he runs out, takes some photos and throws them on Dropbox as the team jumps in and starts editing, color correcting and integrating them via indesign and posts a v2 Dropbox link on Slack for me to review in my car via my phone hotspot before my meeting.
If my editing team needs my input on a commercial I simply open the fcp-x file via Dropbox and tweak it and close it as it syncs for them to see.
If a needy client demands some web updates over the weekend and nobody (including myself) is in the office, I'll take care of it at home by opening after effects, changing an animation, export a looping gif, and then open dreamweaver and code the changes. Those changes sync to the client's server and all the after effects files sync to our Dropbox. When everyone arrives in the office Monday all of their iMacs already have the .aep file and the exported gif on their computer and they will be using the most recent version if they need to do any work.
I've ordered 2 new MBP's so far...
Note that any of that could be effectively done on any PC or Mac, desktop or laptop, able to run DropBox (Windows, Linux, OS X..) and your tools of choice. There's little that benefits you in the new lineup
directly other than the improved display, which is certainly beneficial for graphic professionals, unless the ~1/2lb lightening really makes your day. Other graphics pros may well benefit via USB-C connection to multiple displays, etc., but in your case it seems asa everyone is using desktop Macs.
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Sure, but it could be GDrive or OneDrive, or CloudDrive, or Amazon or Adobe or any other cloud drive.
Most modern companies back their work up and work from the cloud. It's safer, faster, reduces redundent work and user error. If my whole building goes up in flames I can drive straight to Apple Store, pick up a new computer and start working immediately with no visible delay to client.
It's honestly a workflow that my clients are starting to expect by default rather than be pleasantly suprised by with each passing year.
Sure, but while your team may also have desktop Macs of some sort for 'power,' more and more are looking for a 'nearly workstation' single laptop purchase, where computing power (and RAM) is still needed, for the reasons outlined - we occasionally to often take work home, or to customer sites, or on vacation

-/) or ..
Yup, professionals never send emoji's
Would they pay several hundred $s extra in order to have a touch strip to somehow improve 'emoji productivity'? I've got no real beef with the touch strip and think it may turn out nicely for those using the MBPs keyboards instead of docking/external kb, mouse, displays, .. but I wouldn't go so far as to say that the emoji strip will radically improve productivity at this point, for the added $.