How Relevant is Philosophy Today? Wisdom is one part of the answer, that is a general knowledge one collects through all its life, mostly not systematically, either by trying and failing, or by believing others who experienced it before.
The other part of the answer is that there is a negative selection acting on knowledge domains that human kind tries to investigate systematically, and present to children and young adults through formal school education. And as soon as something manages to get investigated systematically, it gets removed out of philosophy domain, and it becomes science, either "hard" or "soft".
The difference between the two is that the latter is limited to empirical analysis, collecting data, categorizing it, but without being able to produce the exact mathematical/logical theory which explains collected data in a general and abstract form, and which is able to predict something based on that data.
What that means, is that when one has ambition to describe something generally and abstractly, but has no power to produce exact "hard" scientific theory, one must step back and say "it's just a philosophy", as I did with my 4 essays, or resort to pseudoscience, which is something that no honest person does intentionally.
The proof that this is true, is Isaac Newton's example. He is now considered a "founding father" of hard science, and as such, he considered himself at that time a philosopher, calling the new science he invented "principia mathematica philosophiae naturalis". Because, at that time, noone would go around saying: "I am a scientist, I have no interest in philosophy.", such a sentence at that time would sound really awkward, because the distinction was not yet established.
And by the way, he spent more of his life in things we consider today pseudoscientific researches, than in scientific ones, but he honestly believed in what he was doing, so noone considers him pseudoscientist because of that.