You're thinking of a PC. This project doesn't address that type of computer at all. 8-bit computers programmed in Forth suggests very strongly that this is aime

You're thinking of a PC. This project doesn't address that type of computer at all. 8-bit computers programmed in Forth suggests very strongly that this is aimed at control engineering, and area where having a few computers makes a big difference to what you can do in an industrial process. It might also be useful for simple radio communication.