My brother-in-law trades contracts only, he is based in Columbia and relies only on charts..... he is happy with his 5-10k most days for a couple of hours work..... having said that, he spent 6 months over there in a class room studying TA only to get to the point!!
I personally rely on both but that's because i am a newby and most of my mistakes (99.9%) are made through lack of TA....... really peeves me to look back on my trades each day and then see on the charts where I went wrong!! It's never about the fundamentals when seeing my mistakes.
But I am an RYG lover, so don't judge my dodgy onion to heavily.