Quote ="red devil !"don't think it matters if u start at 7 or 6 now as which ever u are u stick to ur side of the field therefore if ball is on your side of the field u become 1st reciever and your half back partner is 2nd and vice versa'"
Correct the scrum half and stand off positions are identical in the modern game apart from the scrum feed, but the half backs often interchange and share this duty now.
Like you said one half operates the left and the other plays on the right.
I know traditionalists won't like it but maybe it's time for the naming of the positions in our game to be changed to Right Half and Left Half? It would certainly be less confusing for young kids learning or playing the game.