For me, in a song there is the "BODY" and, possibly, an INTRO.
INTRO in one song is only played one time .... Then, it has not to be merged (in termes of bars numbering) with the "BODY" which is played several times ....
I take a typical exemple (just for the exemple since blues is known worldwide). A standard blues has 12 bars; consequently, those bars are numbered from 1 to 12. If i add 4 bars, a + 4 numbering is done on the basic "body structure". In that case, "BODY" becomes identified with bars 5 to 16. This has no meaning and is very confusing.......
I would like to promote the following idea; to leave the choice to the operator. That is to give him the possibility of choosing the bars numbering.
Do somebody understands my concern ?

Daniel