This is like a weird personal thing that I can’t even explain. For whatever reason, the Y axis becomes labelled as X in my mind in random situations. And I use charts (and other data visualizations a lot).
The funny thing is when I am thinking of X, I don’t have this urge to call it Y. If I am looking at horizontal, X is the first thing that comes to mind. But not with Y.
This should have been done in 2022 and shown to voters that their money is not being used (I am ignoring the Budapest Memorandum in context of US/UK for the sake of argument).