Yes. This CPU and the 16 core variant are really intended for people who would have instead forked out on a Intel x299 system for productivity workflows. This is where they are great value. But not for gaming no. Yes you get a slight improvement in boost clocks because of the higher binning but you are talking about single digit FPS improvements. It's a toss up between the 3600x, 3700x and 3800x if you want the best framerate headroom for your 1080ti. If you have good cooling and want to overclock 3800x will get the highest clocks as its a higher quality bin but it is marginal.Again, I really appreciate the feedback.
I just watched the 3900X launch review video on Gamers Nexus and Steve says it is definitely overkill unless one is streaming or doing production work.
I chose the 3700X ($279 USD plus 3 months free on Xbox One for PC) and paired it with the MSI x570-A Pro ($139USD). I still need to locate a quality used 1080 ti and felt the extra $50 not spent on an MB with features I will likely never used would be better used for the GPU.I think the 3600X/3700X are the best compromise in terms of cost per value. If you want to adventure through modeling, etc. the 3700x otherwise the 3600 should be enough.
MB wise look to the Asus TUF X570. It has a decent price, and very good VRMs that will ensure that you take the max performance out of your CPU.