The moment emulation began embracing mod support, it became peak gaming. You can now play your favorite old games with randomizers to mix things up, higher resolution models and textures to make them look more modern, patches to disable obnoxious elements (goodbye, low health alarms and lengthy animations for basic world actions), and even entirely new content. Not to mention combining games so you need to swap between them to progress, so you can be playing Super Metroid and find a key item for your playthrough of A Link to the Past.