The fact that this is even being debated says a lot more about the credibility of you all than it could ever say about the veracity of technical analysis.

I'm not a professional trader but am involved in the capital markets. Many use a blend of fundamental and TA (e.g., fundamentals to choose the asset and technicals to enter the trade). Some choose one or the other.

Algorithmic trading is a $trillion industry. Fully systematic programs account for $billions upon $billions. Discretionary fundamental programs account for $billion upon $billions as well. In some asset classes (e.g., managed futures), fully systematic programs are preferred by institutional investors because it prevents style drift.