Pretty much every multi sold on this site requires a real working board for that specific multi. The specific multi just basically changes the roms for you and runs them on your real board.
So the games run perfectly.
Welcome to The Projects
Thank your lucky stars that you found this website.
For although there are others... beware!
This is the path to arcade enlightenment.
Follow it closely and you will be rewarded.
I think the list will only be used if there is some sort of shortage of parts so that he can't make enough for the initial demand.
If for some reason he can only make 500, then I think the list is the best way to go.
But if he can make 2000, then F the list...