Earlier quoted context omitted.
The universe is such that the computers that do exist seem perfectly matched to its properties. How could it not be so? Other possible universes might have completely different computers and the kind we have here would be unimaginable there.
If silicon didn't exist, our computers wouldn't seem perfectly matched. It would be a struggle to make them and keep them working.
Not at all.
Gallium Arsenide works fine. So does Indium Phosphide. etc.
Silicon was much simpler to start and then path dependence kicked in. So, we poured R&D money at silicon because it was "better" than everything else. Then, because we poured R&D money at silicon, it was "better" than everything else. Lather, rinse, repeat.