as a cav, i wouldnt cry if it gets implemented, but i think you are underestimating the importance of 1 second, and not to imagine 3 arrows shot one after another, that would practically stop the horse
lsumpter 1.8 seconds
rouncey and steppe 1.4 seconds
desert to destrier 1 second
warhorse to catapraht 0.8 seconds
charger and above 0.5 seconds