Hello Jay-R,
I understand your point of view.
However, I do not think there is really a correlation in there. Even you notice some, it might be just a chance…
The question is that you would want to trade different assets for better risk-diversification. So even you get many strategies for AUDUSD and less for EURGBP, you would still want to trade the EURGBP. It is a different market, it will bring you extra pips.
Kind regards,