How can you know before product announcement that you will not be using Nikon equipment moving forward?
Probability. Mirrorless is a new field - all camera companies needed to produce new mounts, new lenses, new AF systems and new ways of doing things. Existing SLR market share has limited value. Canon and Sony are huge companies, with major sources of income outside photography to keep them running during any bumpy transition period. Nikon is almost entirely reliant on still cameras. Sony got a five-year head start. Canon is a much bigger company than Nikon, and has a mature and effective dual pixel AF system (with the potential to become the best AF system out there, even better than Sony's current system, although Sony has recently patented a similar technology). So, with Sony starting out ahead, and Canon and Nikon starting from around the same point, but Canon running with far greater horsepower, odds are that Canon will end up with the more capable lineup and greater third-party support. Nikon will have to pick its battles carefully, spending resources to fill underserved market segments, rather than simply throwing resources into a broad, omnidirectional push into mirrorless like Canon can.
It's not for nothing that, even ten years ago - before Sony had even made a full-frame SLR - Canon named Sony as its greatest long-term rival in the camera field, not Nikon. That prediction is just starting to bear out now.
Odds are that, in five years' time, it will be one of the big two - Canon or Sony - at the top, and not the much smaller Nikon. It's simply down to size.
How has Canon’s greater resources helped them deliver best in class DSLRs to their customers these past 8 years?
They haven't. It's also obvious that their efforts weren't oriented in that direction. Canon have been coasting in the SLR world since the 5D3, if not the 5D2, relying on incumbency, existing market share and brand name to keep the cash flowing while they focused their efforts elsewhere.
What has Canon been working on in the past eight years? Video. Dual pixel AF and other video AF technologies. EVFs. Data processing for video and live view. Video-oriented lens technology. Fast sensor readouts, to support video frame rates.
And, guess what? All these technologies are equally applicable to mirrorless cameras, and will help Canon move forward in that era.
Meanwhile, Nikon has been busy breeding a better horse and more efficient carriage, while Sony's car has gone from walking pace, to running, to now matching the horse, with much more potential for future development, and Canon's been developing their alternate car engine and associated technologies, in readiness to move into that market when the car finally outpaces the horse. Much of Nikon's horse-breeding and carriage development, eking every last bit of performance out of it before it becomes obsolete, won't be applicable when they eventually move to cars, while most of Canon's work will - while Sony decided to abandon the horse at the first whiff of petrol, moving into that emerging market and building up market share and technology before anyone else realised the horse was approaching its use-by date.
It is telling that Canon's new 70-200/2.8 is a bare-minimum rehash of their existing lens, and that Canon didn't even bother teying to disguise that fact. It's just a way to keep SLR users happy and, perhaps, to simplify their manufacturing processes. Their real work is going into the mirrorless 70-200/2.8, with mechanics and electronics optimised for mirrorless focusing. They know they need it for a successful full-frame mirrorless launch, and will have it ready.
When do you think Nikon froze their mirrorless design and how could that have related to the D850 development?
They haven't frozen it. They just haven't proceeded as fast as the other two major players. Sony's bern making full-frame mirrorless cameras for five years. Canon's been using mirrorless-related technologies in their cameras and (especially) video cameras for just as long, with each iteration improving on the last - to make a full-frame mirrorless camera essentially involves repackaging the same technologies into a different body. In fact, the 6D2 can essentially be run as a full-frame mirrorless camera, retaining effective AF in live view mode, quite unlike the Nikon bodies (and Canon non-dual pixel bodies). Meanwhile, Nikon had not demonstrated most of the required technologies at all, and it took them until quite recently to even demonstrate a half-decent live view display.
When you write "They've never even made an on-sensor PDAF system.", are you aware that the Nikon 1 series was the first camera ever released with an on-sensor PDAF system? Besides, as was just pointed out to me by Jack, they have owned patents on this for 6 years... https://nikonrumors.com/2017/08/03/new-nikon-multi-pixel-pdaf-sensor-patent.aspx/
I meant full-frame. Sony's been doing it since the A7. Canon did it with the 6D2. Nikon has yet to do it.
True pixel-based PDAF systems, like Canon's dual pixel, are likely to be the future. Sony recently got a patent for something similar, but this is one area where Canon has the lead over Sony. Make it quad pixel and every pixel becomes a cross-type sensor. Sony's separate layer approach (using certain rows of AF pixels) may be better in dark conditions, but this could be surmounted by binning pixels together for the purpose of AF, effectively making bigger and more sensitive AF pixels.