Yeah, I have seen PC in console cases before. I felt like what made mine a little different is it's high level of presentation, as well as you'd just turn it on, it'd go straight to what is shown in the video, and you'd never have to touch anything but whatever controller you wanted to use. With something like the Wii, you have to navigate with the wii-mote to the homebrew channel, then pick the channel for your emulator, then scroll a dull list of undoubtedly messy looking rom titles. From what I've seen of Xbox emulators, it's almost the same thing.

As for RetroArch, I'm not sure I'd call it a front-end in itself, but it is invaluable for trying the emulators together, which is why this is running it for almost every system.

There are a million little tweaks no one seems to want to bother with as well, like removing nonsense like (USA)(RevB)(!)(1.3) from roms, renaming them so they make sense Target: Renegade is now Renegade 2 - Target Renegade. Or how I redid the US version of Super Mario Bros 2 to be Super Mario USA and threw the real super mario bros 2 into the NES wheel as if it has been localized. Box art and all. Honestly there are so many little things like that I can't list them all.

Really the point here was to take something that was being primarily used for an Arcade setting, and put it into a console setting. I have not seen anyone do this with HyperSpin.

I posted a video of the NES wheel which shows off some of the tweaks I mentioned above:
https://youtu.be/Uibgwftq3ag

I feel like seeing is easier than me talking about it lol.