Do we need to create "kotlin" folder if there are both types of classes in the project, what is the benefit?

Currently we could mix our java files with the kotlin files in the same folder. As far as I know it was not allowed some times ago and we had to create a special “kotlin” folder for them.

I wonder if there is any benefit to split java and kotlin classes by different folders(kotlin and java) if the project includes both.
Currently I see only the weakness that I will need to jump between the folders instead of having a mix of files in appropriate folder followed some business logic.

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No, there is no benefit.