We are in a bad bad timeline for hardcore and even regular PC enthusiasts, the technological leaps have stagnated significantly, where people with 7 year old PCs need only double their memory and add an SSD (if they didn't already have one) and almost all tasks are fast enough.
The delay in shift from 14nm to 10nm has been pretty bad across the industry, in fact considering the performance improvements for processors, GPUs over the past 7 years, it seems quite apparent that the manufacturing process still plays a very heavy part in the performance boost between generations, just as much as architectural design of the processor.
I have a fairly specific use case, similar but not quite the same to gamers (I want a ridiculously fast PC for general use, I'm an extreme browser, exceeding 100-400 tabs at a time, but I don't game anymore, so I like mid to small ITX, quiet, professional looking machines)
I almost always have open from 8 to 25 applications open of varying kinds. I really like a very responsive system at sub $5000 expense (a 64gb, quad channel, DDR4 4000 machine with 12 cores, liquid cooled, would be great, but the cost would be insane and honestly, a complete top of the line, but not HEDT machine would likely do what I need at easily 30 to 50% savings)
Unfortunately Intel is all over the place with product varieties, when you look around the Intel ARK site (the new one is awful, great job web developers, great job, another unecessary redesign) you can see just how many processors they make, from 6w to 150w across all kinds of segments.
Sadly the days of a "preemo desktop" CPU being their primary bread and butter is over and that's why we see ridiculous things like this article is stating, they are diversified everywhere and the complexity seems beneficial to their bottom dollar.
The rumor is the coffee lake 6 core desktop processor won't work in the existing z170/270 chipset, despite the fact it's basically the same family as the last 2 CPUs for those boards (i7-6700 / i7-7700 etc) just 2 more cores 'glued on'
We also don't know if this new processor was ever intended to come out at 14nm or it was originally 10nm.
There's talk that the new chipset, Z370 isn't even any more than a re-badge of the z270! Which makes forcing people to use it even more ridiculous.
There's a "z390" (?) is a cannonlake chipset or "PCH" - and it's coming out next year - but that chipset is only for cannonlake processors, except there are (apparently) none of those planned for desktop.
So, do you buy an i7-8700k now and put it on a z370, knowing that you might be missing out on some new features in 2018, like bluetooth 5 and wifi ac being built into the chipset itself?
The whole thing is messy and awkward to follow, it's only gotten worse the past few years.
Honestly, I think the best thing to do, if you're capable is to stop reading the news about this stuff and just buy what's best when you need a new machine. It's endlessly time consuming and confusing to be an educated consumer with PC stuff. (I should know, I've wasted possibly years of my life googling / reading this rubbish since I first started building my own machines 20 years ago)
But the long and short of it is, stuff just isn't improving at a fantastic rate anymore. Even if you're silly rich, you can't buy a machine that utterly decimates other machines easily. People can get 60 to 80% of your performance for 1/4 or less.