currency correlations

So I was thinking of only trading non-correlated currency pairs. But reading from investopedia, they say that correlations do change. So what the hell is the point of paying attention to these things?
Although I believe it is stupid to long gbpusd and short eurousd at the same time, but some people fear being long gbpusd and eurousd at the same time cause they fear of losing twice in a row. My experience have shown that higher trade frequency GIVEN THAT YOU ARE MONITORING YOUR AVAILABLE MARGIN AND RISK, is quite beneficial in terms of probability of success....

what do you guys think????

I believe it is of paramount importance in terms of money management, because trading high-correlated pairs in the same time, increases your risk factor in the end.

As for correlation changing in time, yes it is true, but not that much. Just have a look at the correlation between EURUSD, USDCHF and GBPUSD in the last years, they are most of the time driven by the USD part.