[1][2][3] Because the Atari 400/800 8-bit computers were bundled with an RF modulator, stringent FCC regulations limiting radio emissions applied.
Consequently, the Atari 400/800 systems internal construction use large metal frames as Faraday cages to prevent emissions.
The Atari computer family was designed to be easy for novice users to expand, with one universal connector plug.
However, the additional electronics in these "intelligent" peripherals made them cost more than the "dumb" devices for other systems.
The names and the styling of Atari's 8-bit peripherals generally match the contemporary computer family.