Dear Silviu,
Thank you for the insightful, yet simple and beautiful trip! Here is what I take from it. You start from uncontroversial and mundane facts of life, in the search of a fundamental cause. And by simple inferences, you arrive at the conclusion that each event is caused by multiple causes, this leading to a relativity and an incompleteness. By varying one of the causes the result can change dramatically. I think this implicit definition of causation by instability to variations is insightful and captures its essence. And you pointed out rightfully that there are usually more parameters that one can vary and get an unstable dependency on the initial conditions. As a parenthesis, I want to add here that in the discussions about free-will (which you left outside for good reasons, but I just want to apply the idea to this subject since it seems to be of interest for many), the idea is simplified as if free-will should be something that depends on the individual alone, but since there are both internal and external causes, I think a better definition of free-will should include in a more relevant way both the being and the environment, but this of course will lead to something different than what our intuition says. Now back to your essay, as you said, this instability under the variation of multiple causes leads us to the following choice: either quit using the term with reference to a single cause as fundamental, or embrace more than one, and ultimately all of them, as being fundamental (in which case what is "fundamental" if everything is?). Our usual habit to identify a single cause makes us overlook other aspects, and even have completely different views. Who's right, or are we all, what is fundamental being relative in this sense, or it is just incomplete to consider a single cause? Also, I like how you apply the same reasoning to cosmology, in a simple, straightforward way. I realized that at a second reading I find more in your brief essay, so surely there is more to say about you wrote than what I saw. Well done, this little gem deserves more attention! Success in the contest!
Best wishes,