First of all, mind the language please.
Secondly, the Romans encountered a lot of good heavy cavalry during their expansion phase (including the cavalry equivalent of the Carthagian Sacred Band), yet they waited until well into the empire before adopting similar shock cavalry, so things are not clear-cut as you suggest.
Thirdly, you are probably right that the Semitic states of EB's time-frame did not possess good cavalry corpses, but keep in mind that the powers that (tried to) control Judea and the Phoenician cities possessed some of the best cavalry of the time, so the Semites were bound to look bad.
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