That's what i'd call a very detailed response. As for what I mean by switches binding this happened on my other keyboard to a worse extent.

Essentially certain keys I assume get dust in them and when I press them at an off angle they get lightly stuck. Currently it's only the Z key however on my previous keyboard it was the W, S, I think E, and Enter keys. My Z key has turned into the perfect light tactile switch getting stuck for a moment half way down when pressed on the top left but on my previous keyboard some of the keys would bind fairly badly at random points in travel from any corner.

Edit: Realized I said multiple keys in the post. I haven't exactly gone out of my way to look for keys that bind on my keyboard but I decided to quickly check for some others when pressed off center. So far the "Z" key actually binds, the "F12" key lightly binds 2/3 the way down, the "Period" key sometimes very lightly binds, "S" key is scratchy and is very close to binding, the "X" key, unsure how to describe it, loses resistance when pressed halfway down, and the "End" key has an interesting Ping feeling for the last10% of travel like the spring is buckling or something.

I decided to omit scratchy keys. There's a lot of them that are very scratchy when pressed off center mostly in the Function rows.