I played a 4th level Vanguard tonight using my Morlamaw Admittance in SFS Scenario Yesteryear's Sorrow. In one combat we had I made ample use of adjacent allies abilities. I had both the feat Bodyguard, and the disciplines Attractive Shield and Intervene.
The set up was something like this
V= Morlamaw Vanguard
_ = Open Squares
the squares bottom left were boxes that we could not occupy. jut south of the Envoy and Mystic was the door we entered. There was much more of the room to the North, but we weren't able to move there because the enemies were on top of us so quickly.
In this case I was positioning my shield against the right most enemy and guarding the Mystic, while either bodyguarding/intervening as necessary either the Operative or the Mystic. The Mystic was attacking with his battle staff, while the Operative was taking point blank shots because he would provoke trying to move away with trick attack anyway. At one point the left bad guy rolled a crit against the Operative and I Intervened to take half that damage for him. It actually felt like a very rewarding battle style and between Attractive Shield and Intervene/bodyguard, all of which is "adjacent ally" powers, my tanking ability for my party was very effective. Honestly this made Bodyguard valuable to me, as looking at it as it currently stands the feat is very lackluster without Vanguard abilities to give it further utility. Keep in mind I'm someone who ran a VERY effective body guard fighter in Pathfinder. So I was disappointed to see Bodyguard be reduced to something that a.) could only be done once per turn, period, and B.) be stuck at only a +2 bonus with no ways to further improve it, and no "in harm's way" feat.
Bodyguard and Intervene together effectively gives you In Harm's Way, and Vanguard's Reactionary class ability at least helps to mitigate the "Only once per turn" problem just a little bit. (also learning after playing tonight that needing to bodyguard more than once isn't as much a thing since iterative attacks are gone and full attacks are risky)