Nobody is saying that investors shouldn't have understanding or be ignorant of anything here. When it comes to bitcoin investment, investors can make their initial purchase of bitcoin without having any understanding of it. But they should gradually increased their knowledge down the line. What i see as is bad is for someone to be investing in bitcoin for a long time without trying to increase his knowledge along with his bitcoin holding.
Yes, that's very right, Investing in bitcoin without in-depth knowledge will not be a big problem because every new investor must know bitcoin from their friends or from social media, when the first purchase is made that is the initial stage for them to approach bitcoin. As you said, early investors do not understand bitcoin, but they buy and hold and their knowledge will increase throughout the journey day by day.
That also applies to new investors, they want to invest in bitcoin, even though they do not understand much about bitcoin but they have a lot of time to learn about bitcoin.
The investor's journey in investing in bitcoin only needs to know about the initial steps, namely buying on a trusted exchange and withdrawing it to a personal wallet, that's enough for the initial stage before they learn along with the accumulation they do.