In an age of 4K ray-tracing and 100-hour open worlds, why play a pixelated arcade game from 1982?

This is the most frustrating part for beginners.

Starting in the mid-1990s, arcade games (like Killer Instinct , Cruis'n USA , or Gauntlet Legends ) moved from small chips to hard drives and CD-ROMs. The ROM contains the main program code, but the contains the massive hard drive image. If you want to play 3D arcade games, you need both the ROM and the CHD.

Yet, the persistence of ROM packs highlights a critical failure of the commercial market: the "abandonware" problem. A significant portion of the MAME library consists of games that have not been commercially available for decades. The companies that created them may have dissolved, been acquired, or simply forgotten their back catalogs. In many cases, the physical arcade cabinets are rare artifacts found only in private collections or landfills. If the law were strictly enforced to erase all unauthorized ROM packs, a vast swath of gaming history would effectively cease to exist. Unlike a film, which can be preserved on celluloid, or a book, which exists in physical print, a video game requires specific hardware to be experienced. When that hardware dies, the ROM is the only lifeline.