Wouldn't balance between bat and ball make for more one-day cricket too?
I'm sure a lot of it's to do with financial muscle.
Depends if you think the one day game wherever it is played is more of an even contest because generally pitches will be flatter for high scoring games. That side of the one day game has proved to be more and more popular...and that is where the money generates from.
With test matches the advantage of home conditions seems to be greater than ever...winning away as India did in OZ is such a big deal because it doesn't happen that often. Before 2012 it was a considerable time before we won a series in India.
This must of been thought of and deemed not possible but if you wanted to even up test matches maybe the away sides ball is used.
In England v Australia it's the kook ball
India in England the SG ball
Us away in Oz the duke ball/whatever manufacturer we use nowadays.
I think I read Pointing was a big advocate of using an English ball in the Sheffield Shield games.
I suspect long term ball contracts make this idea not possible.