Modern killteam is something between the 4th edition killteam and the old "
40k in 40mins," which was a 400pt. game that developed into the
Combat Patrol format you see in tournaments these days.
The old Kill Team was,
IMO, a much better version of "forging the narrative" that offered a nice alternative mode to use your
40k models in. It also encouraged some crazy conversions (I recall a very cool Adepta Sororitas sentinel conversion
)