Why would something that offers no benefit be "a must"? I keep hearing that it's a "must" but so far I haven't seen a single shred of evidence or any suggestion of proof as to why that would be.
Is there some notation somewhere that says the next generation of Nvidia or AMD graphics cards after Navi and Ampere are going to contain architectural improvements that are positively believed to see gains from the more robust bus? Is there some article indicating that there is going to be a determined effort to revamp the APIs specifically to benefit combinations of PCIe 4.0 graphics cards? Is the next generation of motherboard chipsets KNOWN to be inclusive of multiple PCIe 4.0 M.2 NVME slots, unlike current chipsets that only support a single PCIe 4.0 M.2 slot per board? And when they do, will it even matter, since reviews don't show Gen4 storage blowing up any benchmarks really?
I mean, yeah, I'm sure at some point it will be beneficial, and when it is, it will make sense to want that on any board you choose. And when next I choose a board, maybe later this year, I probably will go with something that IS PCIe 4.0 capable, but it's not going to be BECAUSE of that, and there are certainly a LOT more people out there that won't see any significant benefit from a PCIe 4.0 capable chipset over one that has everything else that board has except for that, than there are people who will. And I imagine it is going to remain that way for a long time.
Even people with the top shelf flagship GX cards aren't going to see much from it, and those people are in the very, VERY small minority of consumers anyhow.