What happened to the PC modding scene?

Ever since personal computing became a common fixture in our lives, the PC modding scene has existed. I can think back to the heydays of LAN parties when many participants would compete to show off their modded systems, and in an era when PC cases were either beige or black, they were eye-opening. Modern PC cases are very different from those early chassis, which might have you thinking the PC modding scene has gone away. But it hasn't. It just grew up along with the manufacturers and found new ways to push the envelope on what a mod could be.