Some people have preferences. I just built an I5 8600K Build (Haven't posted yet), and while I could've went with a cheaper board that worked just fine, I didn't...
I meant he used the 980 from a previous build... Some people want to spend the extra money for an I7, and maybe he built it a while back before Coffee lake and he's just now uploading it to PCPP
I know, I'm on a tight budget. I live near a microcenter, so I'll head there and get one for $300 if/when they come un stock. Or get a 1070. I'm only 14, so I can't make a ton of money.
It depends, the Ryzen build would be better for multitasking or cpu intensive games, while the Intel build would give you a slight framerate increase...