If I might add my voice to the chorus:

A couple of the things you did with unit availability are, I think, a bit regrettable. Speficically, the fact that racetracks no longer give cavalry units-- and, by extension, makes Muslim cities (to the best of my knowledge, anyway) unable to produce cavalry-- makes the horse breeder guilds pretty useless, unless you want to get the guild and convert to a castle.

On a more minor note, I do regret the unavailability of French noble knights. According to what I remember from vanilla, these were available from a certain level of castle wall, but not from stables; however, as you removed recruitment right from the walls, there are no more of these guys. I'm sure that this is true for other units, as well. This is really just a minor thing, but I do regret the loss of the noble knights; I think they look cooler than regular chivalric knights. Would it be a good idea to do something to include these forgotten units-- e.g. reducing the unit spawn rate of chivalric knights from the appropriate level of stables, but also including a slower noble knights spawn rate? I know this is a really minor thing, but it is something I miss from vanilla.