I'm a keyboard user when on my computer, qutebrowser but I think your sentiments are correct, the numbers of keyboard only users are probably much much smaller than the number of people using Adblock. So OPs method is likely to produce a more accurate analytics than a JavaScript only design.

OP just thought of a creative, effective and probably faster more code efficient way to do analytics. I love it, thanks OP for sharing it

Well with me, it's probably 11.

Joking aside, I love to read websites with keybaords, esp. if I'm reading blogs. So, it's possible that sometimes my pointer is out there somewhere to prevent distraction.

I think there might be more than ten [1] blind folks using computers out there, most of them not using pointing devices at all or not in a way that would produce "hover".

[1] was it base ten, right?

Think about screen readers.