I've experienced two outcomes.
The first where they outright did it wrong, imagine someone not understanding basics like variables and parameters, so they just hard code everything and copy and paste all over the place.
The manager said this was fine, since it made our metrics look better, and I ultimately left over this.
In another case, they basically all listened to me and I got to lead a few initiatives. I did have to help out every now and then, but they caught on quickly.
I think Python and JavaScript are learnable within a month. Wouldn't say the same for Java or C#. Personally I still don't touch the most difficult languages, Rust, C++...