[Imp]

Vyrago
The game uses a very simplified model with regards to vision aids, there main advantace apart from range is the ability to see through terrain units without cant. The problem of course is finding this terrain to get the benefit.
On vehicles depends on terrrain cover & whos watching but 1 or 2 hexes is about it to stand a chance of staying hidden. Not to mention you might not get noticed because the other player was moving but at the start of his turn they are not anymore & there you are.
As you say "a scout unit should be adept at movement to contact, spotting and ID of enemy and disengagement."
The ID part everybody in the game is good at, intrestingly in the links RERommie posted no mention of exceptional or any spotting skills are mentioned evasion etc is.
But those parts are down to you the player to carry out.

There use in the game is questionable anyway certainly for MBT in my view they represent part of your regular force who are out having a look not the specialists.
The specialists like any special forces should be several maps ahead observing & directing your main force onto the enemy. I have no military service but would say they locate & fall back or go to ground trying to gather as much info on the enemy force as possible & evading all combat.
The people you use in the game are looking for contact points final confirmation & are not realy scouts at all.
WW2 due to lack of vehicles or there speed, poor radios etc scouts are a lot closer to the main force but still way out front.

Try playing a game as just a scout formation move up locate, perhaps calling in air arty but not attacking directly that seems more to me what scouts do. If the scout formation comes with ATGMs or whatever you might take the odd shot & relocate but getting involved in a plolonged fire fight is an absolute no.

I often do not use scouts at all though I always used to have 2 per company, just find there role can be filled by most units & indeed has to be because your scouts in the wrong place.

On RERommies point stuff dies much faster on modern battlefields, both armour & infantry plus more transport higher speeds all makes for a shorter game overall.