Yes please. I was just about to open a bunch of issues for ax.arrow()...

Having another look into the whole arrow business(/mess), and it looks like Arrow and FancyArrow are arrows where all the vertices are rigidly fixed in data space, which I think is something useful to have.

Why is that useful? It makes them behave badly when anything changes the aspect ratio.

In response to the the original report, I'm happy to add tests, and I think it's now clear what the units are for drawing the arrows (#8770). They might not be the best way to draw an arrow in 99% of use cases, but as long as they're well documented (which I'm happy to do) I don't really see a need to get rid of them.

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