> There is so much low hanging fruit in programming language design and nobody is picking it up
(waves) Author here! I wrote this article about some improvements to C++, but I also made a whole programming language [0] using a lot of these weird techniques. So not quite nobody!
Still, I can see why very few people do it. It's a massive undertaking. Even if one is fortunate enough to be able to spend the thousands of hours it takes to make a language, there's only a 0.0001% chance a particular language will even have a chance to make it into the mainstream. In other words, a glorious, glorious fool's errand.
One basically needs to be insane to embark on such an endeavor. But hey, turquoise bicycle shoe fins actualize radishes greenly!