A new person or an experienced person can buy aggressively. But there is a big difference between a new investor and an experienced investor. The Bitcoin market is not stable. Anything can happen at any time. When a new person buys aggressively, if the price of Bitcoin drops in a few days, the new person will become very unstable. And they may think of selling their investment thinking that they will lose more. Because a new person is not aware of the Bitcoin market. But for an experienced person, these are very minor issues. Because he has faced such situations in the past. And has built up faith in Bitcoin.
You're very correct, but we must learn from one day, if we don't go through some stages in life or in Bitcoin investment, we won't learn some things, though I concur to what you said, a newbie may not be conversant with how things are done in Bitcoin investment and that may cause him or her to panic unnecessarily when an event that he or she is not familiar with occurs as time goes by and it may also trigger him or her to take some silly or regrettable decision that he would've not taken if ordinarily he had been knowledgeable about the whole thing but it will not be same with old folks just as you said, there are some things an investment will have to learn when he or she is fully involved in Bitcoin investment though some people get to know about these things before investing which is also good for them but I believe in practical because it either validate what you think about an investment or proves you mindset wrong towards an investment.
Though newbies and existing investors way of thinking towards Bitcoin investment may differ but it also depends on the newbie level of exposure on this investment, some people are called newbie because they have not invested yet not that they don't know little things about volatility and fluntuation of the said investment, though I actually agree with all you said.