Well that "toy" perception would actually die when 'people like you' actually chime in stating what you use it for.
I'm VERY curious, honestly because Unless these MBP's just announced allow for 4 TB3 ports in the 13" and or Quad Core CPU's in the 13" the 15" is super expensive. I'm really eyeing the iPad Pro ... but I need to create music starting next month ... a love of mine for decades yet the equipment always escaped the capability of my pockets. This year big changes will kill all the roadblocks.
I'm ideally looking for something as modular and powerful as Logic and not undermined like GarageBand (Guitar Tutor seems to be gone).
Differing types of professionals have differing needs and requirements, and individually have to decide whether an iPad Pro can be used as their main device, but perhaps, not their only device. You seem to need a device as a technical professional. You may find the iPad Pro limiting if you only want to use one device.
A business/admin professional (like myself) may need a device that allows you to review and annotate PDFs and Office documents, take notes, connect to SharePoint, and use Outlook for email, taskers and the calendar. In this use case, the iPad Pro works great as the main device, with the office laptop offering advantages such as multiple screens and software not available to the iPad.
In the old days, my desktop was my main device, where I did my work. My Blackberry clone was my secondary device, where I mainly concentrated on communicating. And my laptop was only broken out for travel. Now, the way I work my laptop, iPad, and smartphone are so intertwined, I reach for the one that has the best GUI for the work I'm about to perform.
That said, with the cloud and web apps, by 2020, I expect to not use a laptop.