The higher the differential the higher the efficiency of heat to electricity transformation. If I remember correctly it's a big efficiency gain between 200C and 300C. From economic side of things, more bang for the buck.
Its a different discussion, quite off topic. When the boomers go into retirement, our current economic system with GDP growth focus has a big problem. Our system is based on produce more stuff and buy more stuff. But when the boomers retire, they will buy less stuff. Who will buy supply overhang? Nobody. Even worse, who will pay for the debt incurred to buy overly inflated asset prices, like housing and factories, when boomers start downsizing and start selling?
Look at Japan. They are 10 years ahead of us. It will be tough and depressing until the economic system adapted and prices normalized. On an opitmistic point, humanity will progress and when an economy cannot sell more stuff then it has to sell better stuff.
I think the author wording is a little bit confusing. I think he want to point out, that narrow AI is used successfully only in (niche) applications with narrow purpose. Niche here is not about total market size.
You need to very carefull to apply Kelly Criterion to stock market, as you cannot precisely calculate the p of your investments. If you assume a too high p then you will overbet and its only a matter of time to go bust (see N. N. Taleb MOOCS on Kelly). Thus the Kelly Criterion should be your UPPER bound for real-life investments with uncertain p, stay well below the betting amount what Kelly Criterion would suggest so that you stay longer in game.
Related to this, the best investors in the world are quite old guys. Why? Because they lived long enough to accumulate enough wealth to be of public interest.
This is nothing new. The independent media wrote about this a year ago and mainstream media organized an anti-fake news campaign against it. Now the mainstream presents itself as the saint - BS! 1 year ago mainstream did not check the facts or at least compare natural versus lab origin. No - they steam rolled independent media for publishing "fake" news, got them kicked off of social media and destroyed their income stream. Now it's factual news and they present themselves as saints, without apologizing for their wrong doing. I do not trust these mainstream media outlets anymore. I spend my money on independent news.