Every time I look at this, the value proposition makes no sense to me. The DIY V1 and V2 only have instructions for adding a single HDMI input port (??), and the V3 and V4 are like $350 CAD, which is way more expensive than buying a used KVM on eBay. What am I missing?
Your post couldn't be more true. Decades ago I was sold on MythTV, this PVR software but it only ran on Linux and you had to compile it yourself. So I gave Linux and MythTV a shot. As it turned out, both MythTV and early desktop Linux were a buggy, frustrating mess. X broke all the time. Incomprehensible, ungoogleable compile errors all the time.
I spent so much time troubleshooting MythTV and compilation problems that I ended up learning Linux inside and out and the C programming language to be able understand the compile errors. I went on to lead a major open source project and have had a long career as a programmer, using all the knowledge I gained that started with fighting MythTV.