I code software developer for 33 years are, do a bit with MT4, but I trade to get away from coding and don't really believe in automated systems, don't think the market is that easy.
Human brain required IMHO!!
I have to say I was surprised when I wasn’t able to find the answer to this question within the archives, so I do apologize if the discussion has already been posted elsewhere...
I am trying to uncover the extent (percentage) of traders who are capable of writing programming code for themselves.
My understanding is that many large firms will have extensive programmers and resources available to write and test code at the direction of their trading desks.
However more specifically, among those traders who are responsible for trading their own books, who are not employed by a large firm, how many of these traders are actively involved in programming to assist in their daily trading?

Python and Rust. Python for testing and validation and Rust for automating it all.
Two different things:I have to say I was surprised when I wasn’t able to find the answer to this question within the archives, so I do apologize if the discussion has already been posted elsewhere...
I am trying to uncover the extent (percentage) of traders who are capable of writing programming code for themselves.
My understanding is that many large firms will have extensive programmers and resources available to write and test code at the direction of their trading desks.
However more specifically, among those traders who are responsible for trading their own books, who are not employed by a large firm, how many of these traders are actively involved in programming to assist in their daily trading?
Two different things:
1. Code to test strategies, backtesting.
2. Code to automate trading.
Which one are you talking about?
I recently attended Coursera, learned VBA-excel to code BSM to backtest. But don't have a clue how to code for auto-trade.
I won't call myself a successful trader, just a lucky trader so I should not be part of your statistics.
None of the strategies I studied worked for me.