FYI an expert with this skillset, C, java, python, sql, algo, trading, derivatives etc. Starting salary is 200+K plus bonus in NY
Excellent, set the technicals off, always fascinating to watch. It's only not fair if you know less than the person making the statement. Do you know what separates the wealthy from everyone else, they use time more efficiently.
Given that I know the responses are from technical minded people, why would I explain the concepts of fundamental choices when that is not their field of expertise or their chosen route. So we come full circle back to the OP, R is better than Python and Python is better than Java & C from a business perspective. The inverse is true going from a technical view, so each person needs to judge for themselves which uses their technical/fundamental combination most efficiently.
Because the markets are about making as much money, in as little time, with the least effort, and my own personal twist, as honestly as possible. So if you use a programming language which is inefficient for your knowledge combination all that happens is you end up poor not wealthy which links directly to one simple statement "time is money".