PC Gaming

Fine, I'll bite.

But it's not a console, it's a PC.

Yes, it's a PC with the form factor advantages of a console, making it suitable for placement in an entertainment center. So I expect people to use them similarly to a console, with wireless controllers/keyboard&mouse while displaying on their TV, rather than at a desk with a monitor. Perhaps I should have use the Home Theater PC nomenclature instead. Although, HTPC doesn't necessarily include gaming capability.

Why not use a laptop at your desk and move your gaming PC into the living room?

Physical size is a big deal for some people. Having a tower present isn't always agreeable with other household members.

Or use a streaming service like Steam Link?

I do. However, that requires you already having a fully built out gaming rig, not to mention it comes with severe limitations on latency and max resolution/refresh rate. If someone doesn't already have a gaming PC, then these have all the appeal of a pre-built while being as small as a console. Plus,a lot of people don't have ethernet run everywhere and streaming over wifi is not a good experience.

Build an ITX. That's what I did. And I chose a really nice case from the plethora of available options that fits into my living room nicely.

An ITX case is still too big to fit in my entertainment center whereas the nuc would not have that problem. I can only assume the same is true for some other people as well. It's a little odd that someone who went through extra trouble to go for an ITX form factor wouldn't understand why an even more compact solution has value.

...where did you get that idea?

Because you are arguing from a foregone conclusion that someone who wants one is wrong. You aren't trying to understand, you are trying to win the argument. Your responses read a lot like a troll. If that's not your intention, then I suggest you look at your first response from the perspective of an outside observer and see if it comes off as hostile.

It sounds like you may have purchased one of these things and are personally offended that someone would question that decision.

I have a full tower at my desk, and use a steam link/ps5 for the TV. I don't have to use one to appreciate why others would find the option appealing.

I did pick a NUC for an HMI once. I don't think that made me particularly biased though.