The parallel to the “if it was an 8-bit platform with meaningful disk drive adoption it got Infocom games” rule of thumb is the “if it had 16k and a tape drive, it got Scott Adams games” rule. (And/or Howarth, probably.)
I’ve just stumbled across what seems to be an exception, the VTech Laser 200 series. Underpowered, late to market, and not particularly successful, but it was sold in enough English-speaking markets that I would expect to find Adams/Howarth games on some combination of cartridge or tape. They don’t seem to exist.
Is there another commercial system of the same period which never had their YOHO in the sun?