Cataphract, Clibanarii, whatever, against Infantry

[Justin of the New Yorkii]

I see no reason why it should be thought of as a myth it seems perectly reasonable to me

Cavalry charging straight-ahead at the center of a phalanx of picked hoplites and utterly destroying them?

How many other examples do we have of a hoplite phalanx getting smashed by a straight-ahead horse charge at the center of the formation?

Don't get me wrong, I believe that Alexander's cavalry probably played a big role at Chaeronea, but I don't think they charged directly into the center of a firmly positioned phalanx as Diodorus described. Perhaps, but if so I'd like to hear it from another source.