Couldn't agree more. Likely wouldn't be 2066 pins, but a true HEDT platform replacement that doesn't cost a kidney would be nice. I'm still holding strong to X299, even though it's showing its age. 6 years old and still a champ, heavy OC the entire time. That extra cache goes a long way as well, and I've used all 48 PCI-e lanes to their max, though I dropped dual-GPU out when I got a 4090. Memory benchmarks on fast DDR4 in quad-channel still beats many DDR5 dual channel kits for professional workloads. PCIe 3.0 is holding me back quite a bit in local storage workloads.
Sapphire Rapids on LGA 4677 is interesting, especially their overclockable chips, but they're priced too high, and the competition from AMD makes them feel a bit bland. The 12-core Xeon w5-2455X is about 20% faster than my 12-core OC'd i9-10920X. Dropping about $2k for that kind of performance uplift is hardly justifiable, but at least I'd get some PCI-e 5.0 options.
I'm all for increasing power efficiency, but only for thermals and efficiency/W. Power is cheap in my area. All these E-cores haven't sold me yet. I also don't need monstrous amounts of slow cores as many of my tasks demand high single-core performance. I'd love to see 18 or 24 P Cores clocked at 5Ghz base with the latest IPC offerings. Maybe OC it to 6GHz on my 360mm rad.