Technically x/y is documented via the Text properties in kwargs (https://matplotlib.org/devdocs/api/_as_gen/matplotlib.axes.Axes.set_xlabel.html).

I'm in favor of a new loc='left' instead of x='left'. On the downside, we have another parameter that interacts with x and horizontalalignment. But also x='left' would still interact with horizontalalignment. We cannot get around that completely. Then IMHO it is clearer to introduce a separate loc parameter as a high-level interface that manipulates the low-level interface (x/horizontalalignment).

There's also some layouting happening in the non-axis direction, which overrides any y parameter given to xlabel:

l = plt.xlabel('test')
print(l)  # Text(0.5, 0, 'test')
plt.draw()
print(l)  # Text(0.5, 15.0, 'test')

If we pull x to top level in xlabel, people will get aware of y, but that does not work for setting the vertical position, which we would have to doc as well. Also for that reason, I don't think we should use or advertise x.

Uh oh!

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