There's a class of software project where it isn't very hard to bash together a simple thing that solves a good chunk of the problem, not covered by the languag

There's a class of software project where it isn't very hard to bash together a simple thing that solves a good chunk of the problem, not covered by the language itself, but has endless elaborations you can put on them. These rarely stabilize in the sense you mean, of there being exactly one sensible choice in some domain. (Note difference between "rarely" and "never".) See also: Web framework, Javascript GUI framework, serialization libraries (easy to write the parser(s), endless combinations of ways to handle the resulting JSON for you), and these are just some big frequent examples that leap to mind. There's a lot of these sorts of things.