Companies play the do or die risk game, sometimes they win and sometimes they lose, Apple's done it a few times, Musk has played that game as well as anyone, investors take that risk every day, so to say that it is "Far too risky" is wrong--the most they can risk is everything and investors have taken that pledge year after year after year....
A perfect plan does not exist, you need adaptable and good enough.
Any investor who is investing while Steem is ostensibly hiding the attrition rate data (by failing to produce it), is I think not a professional investor.
When Steem publishes the full data for us to analyze without having to go write some blockchain analysis tool, then we can have a more rational discussion about the perspective investors are likely to take.
Also there is no competitor to Steem yet, for investors to choose between. Given a choice between an illiquid lockup of 2 years, or a liquid investment with less debasement and a better overall model, then investors might act rationally.
