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Ah there it is again. The eternal debate between pokemon fans. Should the game be balanced in terms of mechanics or should it lean more towards exploration-mystery. Should GHOST just be another type (resulting in a first-route rodent being GHOST type in Gen50) or should it reflect elusive magical spirits that you cannot touch unless you are an esper?
In-Game vs. MetaGame
I get what you are thinking OP. Perhaps Ghost should had been immune to all Physical types in GEN1, except GHOST.
>so BUG,POISON which they resist
>NORMAL,FIGHTING which they are immune to
>GROUND, ROCK