Well, Notebooks main use case is a different purpose, not for trying one-off stuff or checking if some syntax is valid. It's for doing stuff step by step, annotating the steps and/or explaining each result.
Web playgrounds are ok for testing some syntax (if you don't have a local REPL/easy way to test), but not for one-off stuff that involves file input or that you want to check against real environment assets.
> Well, Notebooks main use case is a different purpose, not for trying one-off stuff or checking if some syntax is valid.
I know, but that's what I had used it for too. Like posting some code, for example in a HN post ;)
As I've said, I still use it mainly for documentation.
Web playgrounds are ok for testing some syntax (if you don't have a local REPL/easy way to test), but not for one-off stuff that involves file input or that you want to check against real environment assets.