I have converted many professionals away from TVs because when you can actually have real quality monitors to compare them too it's usually a no-brainer to abandon the cheap TV. No trick, no incentive for me, just the better choice. It is also why every employee in our company has a pair of IPS displays.
I've looked at 4K TVs as options for a monitor multiple times, from the early Seiki TVs that hit at the start of the pricing change to what's been on offer for Black Friday, don't do it to yourself unless you are spending most of your time gaming/consuming content on the same system or just using it to monitor things.
If you are going to be sat in front of displays for 10,000 hours a year working/focusing (like many of us I am sure) then investing in something like a pair of Dell U3415W, LG UM95 or LG 31MU97Z-B will give you a much nicer experience. Totally appreciate that isn't a $300 solution, but as professionals we should invest in (or demand from your employer) good tools.
To those of you who are using 4K TVs, it is obviously hard to get in front of these monitors and see the difference, but if you can you should - you've already made the choice to go for something better than a cheap 22" 1080P monitor, there are a lot of options to create a great environment to do your best work.
The article is just pure marketing anyway for referrals, so make of that what you will.