can we say that the level of "askers" is getting lower and lower?
I'm not sure why you would be surprised by this effect. I can think of two major causes, one "internal" and one "external".
The internal one is...you are more experienced and knowledgeable with Pis than you used to be, so newcomers who only know as much as you knew when you started *appear* to be less knowledgeable. This is akin to the case of visiting a college campus years after you've graduated. You'll be quite startled by how young all the students appear to be.
The external cause is actually a feature, not a bug. The early adopters of the Pi (or any tech, really) tend to have a background that is a good fit. As the news of, information about, and interest in the Pi spreads, it sweeps in people with less and less background knowledge. While it can be frustrating, and tempt old timers to respond with "RTFM" to a really basic question, the less knowledgeable need to be *gently* led to how to do research to answer their own questions.
I have a personal policy that I try to follow (I don't always succeed). That is, when answering questions in the Beginner Forum, I try to not only answer the question at hand, but explain *why* that is the answer. In Troubleshooting, I cut back on the full explanation because, presumably, asking a question there implies (to me) a higher level of existing knowledge. In Advanced (on the rare occasions I comment there), I'll just supply an answer because anyone posting there *should* know how to run with that. I'm not saying that anyone else should follow the same procedure, only that one ought to be cognizant of who is likely to read a given answer and at least try to fit the answer to the question.
In addition to the above...I consider posts that appear to be "homework" to be a special category. We are not here to do someones schoolwork. I'm willing to provide some guidance, in the sense of pointing the questioner in the right direction, but not to directly supply the answers the person is *supposed* to discover on their own. (That is, asking a question here is *not* "research".)