Quickly seems like an overstatement; you've always been able to write low-barrier to entry, slow, buggy code. Is there a low-barrier language that doesn't end up with a lot of less-than-ideal code samples?
I support over a million lines of powershell. It's pretty hygienic, for the efforts of a hundred low-skill contributors.
The language has flaws. But the function parameters are an joy and incredibly powerful. The validation and type coercion is excellent. The functions are extremely composable.
Overall, it's the epitome of "pit of success".
The same team that has all this powershell also has about 50k lines of Python. The Python has the stench of swamp farts, so I don't think it's team skill that makes the powershell work so well.
