A dumb question perhaps but are scouts that ride horses as stealthy as scouts on foot? One assumes that a horse is a rather large beast and it would be tough to stay unseen in any type of clear terrain. I ask because I've got some cavalry scouts in my core and I'm not sure if it's worth it.
Your line of thought is correct, however they are still scouts and used carefully, well they should work out, then again a lot of this may depend on the terrain you have to scout. They most certainly easier to spot.
Bob out
__________________ Eternal War(gaming) PanzerBob
"Whenever in future wars the battle is fought, panzer troops will play the decisive role..."
Heinz Guderian, General der Panzertruppe
Just for the record, being scouts (as a unit class) does not give any bonus to stealth or spotting. Most scout units have a (small) bonus to experience and morale and that gives them slightly above average abilities. As scout units are smaller they are usually a size smaller which helps them stay unspotted. Finally they carry less equipment so most scouts get a point more movement. That makes it easier to avoid detection or get out of trouble.
Staying unseen and seeing as much as possible yourself is a survival trait for all combat troops, not just scouts.