Digital Foundrys Ryzen systems are poorly configured, I also believe it has something to do with the MSI X570 Carbon motherboard they use for the Ryzen CPUs (known to be a terrible MB).
In DF's own video they state the 3700x beats the 3900x in some tests. Ok cool, maybe the latency of the 2 chiplets of the 3900x causing these issues. But then in their 10600k video, they say the 3600 beats the 3700x in some tests. That should not be possible at all, the 3700x has 4 cores per CCX and higher clocks across the board. I have never seen the 3700x lose to the 3600 period. Something is very wrong with DF's Ryzen setup, no doubt about it.
And even if you look at the Cinebench test for the 3700x it is lower across the board to other sites including Techspot. DF gets 494 or 498 on the single core tests and lower multi core test as well. Even my 3700x gets 509-510 the same as Techspot.
DFs Ryzen systems are poorly configured on an poor MB platform. No doubt that is part of the problem, but DF also tests older DX11 games like Crysis 3 and also Kingdom come deliverance. I don't play either of those games and I don't find them reasonable as a benchmark for future games either. DX12 and Vulkan are the future. Even ACO is DX11. But I am also running a 2080s with my 3700x and I don't experience the issue that DF has in any of the games I have played over the past year now. I have played ACO from start to finish and have had an stutter free experience.
I get no stuttering or issues. I find DF to not represent an optimal Ryzen platform, even without tweaking any timings their systems are poorly configured. And as other posters have already pointed out, DF are also taking the smallest fraction of a specific game and reporting those figures. That is not representative of every game or future games either. I do find their testing flawed.
All in all DF's has sub par Ryzen systems with flawed benchmark testing. And I can assure you that if DF had a properly configured Ryzen system they would have much less or no issues. And if they tweaked their RAM timings as shown by Steve in his Ryzen RAM tweaking guide they would raise their 0.1% and 1% lows hugely with that 2080ti they are using. But first they need to sort out their Ryzen platform issues, they do have a major problem with their current setup.
And DF also need to revise their benchmark lineup after sorting out their platform issues. Some of their games are so old that they came out years before Ryzen (hence no optimizations for Ryzen) and really not a representation for what to expect from future games at all. I already get enough FPS in older games like the Witcher 3, but it is future DX12/Vulkan games and upcoming next gen console games that will be what to expect in the future. Games will be using the newer APIs and getting more multi-threaded, not less. DF's testing is short sighted and inaccurate. We will absolutely be seeing more multi-core and Ryzen aware games coming out, not less.
And here, just type "intel cpu stutter in games reddit" into google and look at all the Intel owners complaining about stutter. It happens to CPUs from both companies, either setup incorrectly or issues with specific games.