Why do people suck so bad at playing slow tempos, then? Why is this even an issue?Feeling the larger space of whole beats is stronger and less prone to moving than building beats through increments of notes.
This seems to be the crux of your claims and obviously I totally disagree. Again there's an artificial distinction between "beats" and "increments." Whether you call a pulse a beat or an increment or subdivision, it's still just a pulse, and it's well established that it's easier to judge medium speed ones accurately than very slow or very fast.