That's my point. You can have the 'best' and yet still not have the performance of something lesser without the support of all the other components. Godlike board doesn't offer anything above what the ROG Z390-I does, except extra pcie slots and a few more fan headers. Costs a lot more, too, but doesn't get you any further when you are only pushing a single gpu. Full custom loop needs to be a consideration from the start, not an afterthought. Your case choice, psu choice, fan choices all play a role. Going for a full tower to fit eatx and fcl is entirely different than trying to cram everything in an mITX case, or will the D15 interfere with the gpu backplate because the Godlike pcie slot is 3mm too close to the socket. Just buying expensive doesn't mean the best. Full towers have lousy airflow compared to ATX or mATX cases, massive amounts of volume to try and move. Over spending for no reason is pointless, value is getting the performance out of what you are buying. Why spend $500 for extra pcie slots you aren't going to use, when a $300 mobo work just the same.
Just like NVMe, you actually get better performance, longer lifespan from most 1Tb, vrs 512Gb in the same series.
Fastest cpu does nothing if it's not supported by everything else. C16 4000MHz is faster than C19 4133MHz.