I do miss the HEDT days. Still rocking X299 with an i9-10920X @ 4.8GHz all-core. For me though, it's less about the core count and more about the PCI-e lanes, quad-channel memory, 8 DIMM slots, an overclockable CPU, and near-Xeon stability. My Tuf X299 Mk1 board has been a beast and runs my 64GB kit of DDR4-3600 CL16 at DDR4-4000, CL16 without sweating.
My dreams for the next HEDT platform would be similar, but right now, I care more about frequency than core count. I game, run the full Adobe suite, do heavy encoding, run a few Hyper-V VMs and an NVR, all on one system. Since I game a lot, frequency is important, and all other applications can benefit from that. I don't need 64 or 96 slower cores if applications aren't going to use those cores.
Having 16-24 cores that can run 5.2+GHz stable all-core (none of those efficiency cores), non-stop, would be awesome. With the 5 NVMe drives I run (don't forget at least 4 SATA ports for HDD storage), dual 3090 GPUs, USB and audio expansion boards, capture card, I need more PCI-e lanes than Intel's puny 20 lanes. What a joke - 16+4 lanes. I know PCI-e v5 has double the bandwidth of v4 and running a GPU at x8 on v5 is totally fine, but I run my systems for 6-7 years before upgrading, and that doesn't leave much room for future upgrades or other expansion cards. I'm also not in a rush to move to 128GB RAM yet, 64GB of higher-bandwidth memory is fine for now.
Bring back enthusiast HEDT! Give us those lanes and memory bandwidth! Give us high-frequency CPU options as well as high core-count options! The way Intel has been failing, I'm likely to move to AMD, even though they aren't king in gaming, and I personally don't find AMD as stable as Intel.
One rig to rule them all, and in the darkness, bind them.