In T3431#60478, @kyrios123 wrote:

Well... it's there already...

$ dmesg | grep microcode
[    1.163941] microcode: sig=0x906e9, pf=0x20, revision=0x48
[    1.164230] microcode: Microcode Update Driver: v2.01 <tigran@aivazian.fsnet.co.uk>, Peter Oruba

Kinda different things. RetroArch is like whole "console" OS. There is also an OS named "Lakka", which is RetroArch. It tries to do many things, downloads cores of many emulators (including Mednafen, it doesn't include all Mednafen cores though). Not to mention it needs a lot of setting up, unlike Mednafen, which is already set up for the best settings, and you need to configure Controller only, which is done through in-game GUI.
To be honest, I never even used command-line with Mednafen, it does not need extra set up, because it comes with the best settings by default, for 1:1 emulation. And if you need something to change, you can do it through easy to understand config file, provided with documentation on website. All I do for example is right-click .cue file (PS1 game), select "mednafen" and play. No bullshit.