Einstein, Bertrand Russell and even Wittgenstein himself were all armchair philosophers. They just formed their deductive powers in the modern scientific era.

Einstein, Bertrand Russell and even Wittgenstein himself were all armchair philosophers. They just formed their deductive powers in the modern scientific era. Wittgenstein is well-known for changing the origin of mathematical problems to the most convenient in his mind - about as close to philosophy as you can get.