IMO, it is just a continuation of the classic recon/scout role. My spotters are built to do that job . . . FREX, instead of having pilot injury resists in the head, they have the rangemaster to get +120m sight. Typically I use a classic jumping mech- Firestarters early in the game, Phoenix Hawks when I can get them, and Kintaro or Wolverine for heavier forces if the PXH is damaged. I also put either the hit defense or -35% stability gyro. The recon mech is typically equipped with mid to short range weapons- current PXH has 2 MLs and 2 SLs as well as physical attack boosts.
The Marauder and Catapult sit back in woods firing away, the Zeus with the turn early pilot (it moves 1 class lighter) is the mid fighter, walking forward while blasting away.
As far as the AI adjusting . . . it does, I have had it pass on actions for mechs that turn if I did.
Besides, you want to talk about AI not adjusting you look at MechCommander 2 . . . the AI attacked the first thing it saw and did not stop until it died, increasing AI difficulty was just a slider bar for headshot probabilities. You could take a Anubis, run it in to a collection of enemies and run it away . . . and your assaults/heavies could sit there as the opposing mechs walked into UAC/20 range, getting lit up w/o firing back.