Also if a bitcoin participant understands so little as to be unable to do basic transactions and cold storage it's pretty clear they can't possibly be an informed "investor" in bitcoin. Do you disagree?
Yes. All an investor generally has to know when arranging a portfolio is how assets have performed in the past and how they can be expected to perform in the future, especially in relation to other assets. Especially when a portfolio is diverse, a certain number of mistakes is tolerable, especially when someone has a small position in something volatile or as a hedge, because say, gold performs well when stocks perform poorly.
I think that an investor who simply decided BTC is likely to increase in value in the long term while experiencing a lot of short-term volatility, who knew nothing else about it, and invested some portion of a portfolio in it based solely on that assumption, would probably do just fine.
By comparison, someone who wanted to invest more substantially, or to do things like day trading BTC, would be foolish not to know more than that.