To expand on your comment, the reason why we don't use simple and understandable tools like Smalltalk is that the industry is not interested on this kind of simplicity. For them it is much better to pay thousands of people to work on different, unrelated things and them put these things together at all levels: hardware, OS, software, etc. The resulting system is impossible to understand by a single person, and works only because of the continuous struggle of thousands of people to make it work. But this is positive for the industry behind this architecture: every year they will create new components to fix flaws, introduce new ones, and keep the wheel of the technology industry running.