Originally posted by Evincar (edited for clarity)
Just think about it: say you have 50 Knights, which you used for Mid Age conquest. You get Military Tradition, and then what do you think is best:
a) Disbanding knights to get 17 shields and save a turn (no more) in building cavalries.
That means you'll need like 10 turns to build your cav force...And when you have your armies completed, maybe your enemies have rifles
b) Press shift-U and pay 1000 gold. Blam.
Instant cavalry force. You can then use your production to crank out more cavs, universities, muskets or whatever you like.