In contemporary programming systems, it's long been unnecessary for programmers to write all the underlying code using basic logic symbols, even for a very small software, as the workload would be unimaginable.
Programmers, in most cases, use ready-made development tools, including various application platforms. These tool platforms themselves are software packages that can output results upon following their operational instructions.
The software package itself is composed of massive amounts of the most basic logic code, but programmers using them don't need to, nor can they possibly understand every line of code; they just need to know how to apply them.
Advanced programmers understand the principles and, if necessary, can design a better tool. However, even they don't know every computational step inside when using the tools, akin to operating a black box.
The "black box" nature of programming development has become even more pronounced upon entering the AI era.