Perhaps I can shed light on the inevitable question of “why” that follows every technical inquiry. I’m hoping to use mine headless as well, since I spent about $4500 on it and without spending $20,000, it’s the most powerful machine they made capable of running both windows and Mac back to OS Mojave, which it does perfectly. It’s the most useful computer I’ve ever owned. …except that as nice as the 5k display is, I work all day on a 45” curved LG and coming from that, I’m squinting at the 27 & have no way to fit both displays on my desk. A Mac mini would be a huge step down. In a perfect world I’d just turn off the iMacs display and set the LG as the primary and only active display, driven by the powerful gpu, but OS X provides no way to do it. …which is funny because if I want to work solely in Windows, I can boot into that and do exactly that no problem. But then it’s goodbye OS X completely. SwitchResX etc will dim it but not turn it off. The longer this big resource-heavy 5k display runs on this thing, the closer it gets to burning up the gpu, so this may also prolong the boards lifecycle, which would be great.