[visural]

From what I see it is usually well intentioned but not exceptional developers trying to write "good code".

They know some sort of abstraction is called for, but they end up picking abstractions which are actually a net negative for code complexity, rather than a positive. If you have enough of these developers then it devolves into code very much like the OP.

There is also a resistance to large refactorings which "clean house" of these sort of abstraction errors in enterprise teams and a lack of developers with the skill (and balls) to do it. So this cruft tends to accumulate.