I think this is a good idea.

Should be easy enough to capture vert, emit and deprecation warning, and then set orientation accordingly.

(and while we're at it, the manage_xticks arg should be renamed to manage_ticks, as it covers both orientations)

just throwing this out there: what would you say to manage_labels?

well technically it's managing ticks, tick labels, and axis limits so I think manage_labels is worse than manage_ticks, and perhaps manage_axis is better?
I also wonder whether it really needs to manage axis limits -- can't the standard margins system do that just as well? (needs to be investigated)

good points all around.

just noticed a wrinkle: boxplot.vert is an rcParam

We know how to handle deprecation/renaming of rcParams too, but thanks for pointing that out.

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At least adding orientation should hopefully be uncontroversial.

Would you want separate PRs for boxplot and violinplot to keep it simple? The review process for the boxplot section will probably take a bit longer because it involves the deprecation of an rcParam which Ive never done before.

Should we simply deprecate the boxplot.vert rcParams without replacement? This is more of a plot-type setting rather than style. It’s not useful as a global config or style parameter. The only use case would be a local context (e.g. via a context manager) if somebody wants to make multiple horizontal plots. But for that rare case using the parameter explicitly may be good enough and is more clear for the reader.

I believe, we also don’t have that config for bar() or hist().

Should we simply deprecate the boxplot.vert rcParams without replacement? [snip] I believe, we also don’t have that config for bar() or hist()

I think that's a good idea and the justification is solid, IMO