The idea it's recommending a 3600 over a 10600k for a thousand dollar build tells me there's a slant...
And they've has offered the 10600k with a $20 rebate on motherboards for months now...
$50 should come straight the case which is totally overshooting for a budget PC (I recommend the 300L here)
That leaves you with a 10 dollar difference for an CPU that competes with the i9 in gaming...
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And by the way, even the next build up chooses a 3600X over the 10600K despite the former even beating the 3700X in gaming benchmarks.
The 10600K is an insane value for gaming, and still fast enough for non-gaming tasks. Seeing as they're listing "heavy gaming" as a measurement on these builds it doesn't make any sense for at the very least the i5 to make an appearance.
Consider these two builds:
1. Ryzen 5 2600 ($150) + RTX 3070 ($500) for $650
2. i5-10900k ($280) + RX 5700XT ($330) for $610
The first build with the RTX 3070 is far better. The RTX 3070 buys you into 1440p high/ultra @ 90+ FPS, or 4k med/high @ 60+ FPS. Will the 2600 bottleneck that GPU? Maybe, but you still get better performance for the price by investing in the GPU versus the CPU.
Also your comparisons are quite poor... 2600 shouldn't even be in the running here, the 3070 would be held back from doing the thing it does best, high FPS 1440p (in actual games mind you, not just CS:GO)
My suggestion over the included build is spending $10 more on the build and getting a 10600K.
Silicon Lottery has found 100% of 10600ks will do 4.7 Ghz sustained all core.
Even at that number it will easily out perform a 3600 in a meaningful way. Over 70% of them do 4.9 Ghz which where it starts to reach i9 levels of performance in gaming by the way...
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And the cherry on top over the 3600 is you can actually buy the i5 outside of Microcenter. Microcenter is the only place carrying the 3600 for $180... but they also have 10600k on perma-sale for $250.
Meanwhile outside of Microcenter the 3600 is rarer than hen's teeth while the 10600k is widely available at $270. I happen to have 5 microcenters within an hour or so of me, but most people don't have that luxury.
Ryzen 5 2600 + RTX 3070[1]
80 FPS - Ghost Recon: Breakpoint 1440p / Very High
78 FPS - Horizon Zero Dawn 1440p / Ultimate
72 FPS - Red Dead Redemption 2 1440p / High
115 FPS - Death Stranding 1440p / Very High
220 FPS - Doom Eternal 1440p / Ultra
124 FPS - Resident Evil 3 1440p / Max
75 FPS - Gears 5 1440p / Ultra
67 FPS - Ghost Recon: Breakpoint 1440p / Very High
73 FPS - Horizon Zero Dawn 1440p / Ultimate
70 FPS - Red Dead Redemption 2 1440p / High
111 FPS - Death Stranding 1440p / Very High
185 FPS - Doom Eternal 1440p / Ultra
104 FPS - Resident Evil 3 1440p / Max
77 FPS - Gears 5 1440p / Ultra
I hopped on Gamer's Nexuses 3080 review just to get a number for a 5700XT and an i7 and Horizon Zero Dawn comes in at 10 more FPS: https://www.gamersnexus.net/images/media/2020/rtx-3080-fe/hz...
You can spot check the other numbers and find similar discrepancies...
Of course the reason I can't find a proper reviewer doing this exact setup is because the idea of buying a 2600 for a new build doesn't make any sense period...
Even the i3-10100 beats it in gaming, and that costs as little as $100...
The difference is key.
Meanwhile it trades blows with the 5600X unless you're making a 7zip decompression and Cinebench rendering mule...
I'm guessing that's why they're not recommended? Being able to actually get the CPU is pretty important...
There's no sense in intel right now when doing a new build.
Giant asterisk during a global pandemic no?
And that's paying $50 more than what is apparently already too much for almost equivalent gaming performance (slightly better after overclocking and the motherboard and cooler priced in above support that too)