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DEPR: join_axes-kwarg for pd.concat #21951
In particular, it is basically irrelevant with the deprecation of
Note that the dtype changes due to the intermediate object having
It is certainly true the way it is explained and spelled (eg the fact that you need to pass a list) is certainly outdated now Panel is removed. But we could also consider improving it.
You can eg now use it to basically do a 'left' join.
(note that I am not married to the keyword, I have never used it myself, but just think we should have a bit more discussion about it. It would be interesting to search for usage on github/SO)