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 add entirely new content (this was extremely difficult in the past, but modern decompilation projects have made better tooling possible as a side effect).

There are even projects 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 where a missile upgrade used to sit and vice versa.