guys , if you want low voltage mobile cpu just get the "T" models form intel. and pick ANY itx motherboard you like.
Intel allways released the laptop version of their i7 and i9 for desktop motherboards. look for i7 13700T / 14700T and i9 13900T/ 14900T etc
In a way you're right. Mostly when a guaranteed peak energy consumption is the principal goal.
But I've gone looking for these Erying boards for a combination of size and value.
Size: A mini-ITX board in a low-profile case isn't that much bigger as a µ-server than a NUC, while internal expandability can be crucially better where it counts (e.g. 10Gbit Ethernet via M.2). And these mobile-SoC mini-ITX boards are just a little less cramped than a socketed board, which typically require a cube-type chassis for air-flow.
Value: you get some pretty awsome deals e.g. on an 8-core Tiger Lake i7-11850H SoC with the mainboard for less than €300. Compare that to an i3-305 Alder Lake Atom and you may opt for the slightly higher idle power consumption but the vastly higher peak performance at still reasonable and
regulatable energy expense.
Socketed T-type CPUs don't tend to sell at bargain prices, but cost nearly the same as non-T or even -K chips, when new. I have not seen them get bargain deals, even when older.
Older generation mobile chips, on the other hand, just don't get put into new notebooks. So if there is a surplus, they tend to go into NUCs or Mini-ITX boards at evdiently high discounts, while their performance is still top notch, expecially with the expanded thermal headroom of a stationary device with a proper Noctua fan.
I have an i7-12700H, which is offically a 35Watt TDP device, configured to 120 Watts peak and 90 Watts sustained. It has my Ryzen 7 5800X3D look rather bad in most synthetic benchmarks at very similar power usage, but runs very quiet and efficient with a Noctua cooler.
Yes, you get a soldered SoC, but you tend to pay a high premium for the flexibility of a socket in this segment, while the probability of using that tends to be migher in high-end gaming towers.
I like that you're given a choice and am only sad that Erying doesn't sell the Xeon variant of Tiger Lake in Mini-ITX, only the slightly larger board variant, still at around €300: I prefer ECC RAM even in servers that are µ.