As a complement to my other reply to you, I'll note that I developed a simulation system in Java (a very common language), and strove to keep it small, avoid co

As a complement to my other reply to you, I'll note that I developed a simulation system in Java (a very common language), and strove to keep it small, avoid complexity, and generally make it approachable -- but for a long time I remained the only one who understood how the system worked, because you simply had to understand the business domain in order to understand why things worked the way they did. This is my personal opinion, but I think that domain expertise is a much stronger component of bus factor than language choice is. You can write unmaintainable code in any language. But good code often still has prerequisites to understanding. Meanwhile, if you have the domain expertise, you can get quite far in understanding semi-bad code just by pattern matching on manifestations of your domain.