It's obvious that a country with higher interest rates will (over time not a 15m or D1 chart) out perform a country with lower interest rates, unless the variables within the country change and the interest rates are not changed to reflect that. That is why if you have to use indicators use them on higher time frames.... why? Because they lag and this lag better reflects fundamental values. If you are trading fundamentals on anything lower than D1 don't worry about it this will never make since to you. If you are trading news releases on the 5-15m congratulations you have figured it out. Point being is that while a news release may have a more short term effect on price, the determining variables like inflation rates, unemployment rates, interest rates, etc.. will have a longer impact on that nations economy. SO is trading fundamentals profitable? IMO that would depend on the economic knowledge and patience of the trader.
It's me...