It is expected that beginners understand Bitcoin first, and if that understanding is lacking, there is no need to buy Bitcoin if they do not understand it well. When one understands Bitcoin, they will know the importance of buying, and they wouldn't want to miss the opportunity to do so.
I bought my first bitcoin without really understanding what bitcoin was really all about, that's just the irony of this whole bitcoin investment of a thing. Someone close to me just persuaded me to buy it at that time. It was when I made that initial investment that I started developing interest in knowing more about bitcoin. I believe there are many others that had similar experiences as I did.
If I had waited to understand bitcoin well I wouldn't have gotten started when I did, probably I wouldn't be here today. So I don't think knowledge and investing in bitcoin is a one way traffic. It can work either ways, some know bitcoin well before investing and others can start investing first through the help of colleagues or family members and gradually begin to develop knowledge and more interest about bitcoin.
I get what you’re saying, a lot of us only got interested in Bitcoin after we bought a little. That curiosity can definitely kick-start learning.
But for new people, it’s still worth stressing: before putting money in, at least learn the basics of how Bitcoin works, how to buy and store it safely, and how to avoid scams. A small amount can be a tuition fee for learning, but going in blind with larger sums can easily lead to losses or stolen funds.
Start small, learn as you go, and protect your keys first, that way you still get the benefit of early exposure without unnecessary risk.