It's hard to expect a really detailed analysis from someone still in high school. On the other hand, it is good to see how the various languages look like from a fresh perspective of someone with relatively little preconceptions from years of using C/C++/Python/whatever. After all, if he has lots of problems with writing something in C++, but much less when writing it in Go, it probably means lots of us had at some point to internalize lots of knowledge that's not directly relevant to the problem being solved, but to the intricacies of C++ or whatever. If the next generation of programmers can avoid this, that's a huge step ahead in what problems we will be able to solve.