| Here's my take on your questions. Anecdotes [1] generally aren't the focus of academic philosophy. Modern philosophy focuses on arguments from Axiom [2] where a statement is taken to be true as a starting point for an argument. Responses to the piece of philosophy then take the form of criticism of the logic of the statements contingent on the axiom, or as arguments based on different axioms. In other words an anecdotal argument is "I've seen and heard x, so I believe y" an axiomatic argument is "If x if true, we should believe y". The important difference is the accessibility of each to logical analysis and discussion. Anyone can engage with an axiomatic argument by considering its premise and following statements. Anecdotal evidence relies entirely on personal experiences that another arguer may not share. Training in academic philosophy prepares a person to engage in logically consistent criticism of existing philosophy and the production of well argued original works of academic philosophy. You are right that you don't have to be a trained philosopher to think for yourself. In the same way that training in martial arts helps with punching, or training in coding helps you write better software, training in thinking helps you think. [1]https://en.wikipedia.org/wiki/Anecdote [2]https://en.wikipedia.org/wiki/Axiom |
What this means is that philosophy ultimately becomes an extended argument over which propositions to take as axiomatic. One commonly-used technique in this is the thought experiment, and some well-known, much-debated examples, such as Frank Jackson's "Mary's Room", are not even anecdotal evidence.
While, I suppose, analytical philosophy could always be presented in the form an analysis of what follows from a given set of axioms, what almost invariably happens in practice is that individual philosophers act as advocates for the particular axioms that they believe actually hold.
There also seems to be a pervasive shared assumption in current analytical philosophy that analysis of the use of language can be the ultimate arbiter on questions of how the world actually is - a questionable belief that is not questioned as much as it should be, or so it seems from my very limited perspective.