Do you know how many startup companies that come up with failure after few years of investment? He followed his mind and this happened, something that doesn't happen every time to time so if I am in is shoe I won't regret a bit, because it's not the end of yne world.
I will always prefer to understand something before investing my money, because at least I will know what to expect, I can't imagine investing money on something I don't know anything about or something I can't understand even when I tried to understand.
I respect his decision and I will do the same if I found myself in such decisions making state.
I agree that it is going to be a big deal before we could end up investing into something, but then becomes a lot easier after we do it, the first starting point is always the hardest for many people. This gets a lot easier if you end up learning what you are investing into, because if you know what you are investing into then you are going to be able to invest a lot easier as well. This is just how the business world works and you should be able to do something that's a lot better.
I hope that it gets to a point where we need to end up with knowing so much that we end up investing without worry, for example Bitcoin is like that for me and I can invest very easily without worrying about it and the rest is just easy stuff for me that's it.