You can even see Hendry at the end of the interview suffering from the lack of price targets, models, numbers and things like that (typical HF mindset).
He wants control but exponentials dont work like that, that's the type of thing that can work in large mature macro assets like developed market bonds, gold, etc. Econometrics will simply not work in crypto, at least not now. The false confidence that comes from it will lead to mistakes.
This is why crypto leads to a quasi religious mindset where people swear by bitcoin or eth, preach to other people, brag about their staying power, hold symbols in their house (like physical metal bitcoins) etc. This is not foolishness but rather a human solution to the issue of not holding an exponential trend
The same way that there are no atheists on foxholes, there are no semi-bulls after 80% bear markets. Either you are in, or you are not
If you are in, you have to become a believer, otherwise the volatility will make you sell
That's the preferred solution for most people, but there is an alternative which is to lock your Bitcoin or ETH in the blockchain and prevent yourself from selling. I like this alternative very much and I'm using it right now but its advanced and it will not work for most people