Some armchair philosophy here. I think languages are fundamentally related to how we think about, process, and express ideas. When you spend a lot of time doing

Some armchair philosophy here. I think languages are fundamentally related to how we think about, process, and express ideas. When you spend a lot of time doing something, you naturally come up with the words to express complex and abstract ideas, which lets you process information faster. These competitive programmers have the experience to realize certain syntax, patterns, common functions better helps them solve the problems they usually encounter, so they build these DSLs to serve that purpose.