many military series knives have ramps on them now...
because someone in the govt made that a requirement
so, the BK7s, BK9s, and BK10s got them... other Beckers don't...
there are other companies with ramps. lots of people remove those too
as for stabbing, Beckers, and thumb-ramps... there's the classic Becker test: soaking a hand and handle in oil (mineral/transmission fluid?), then stabbing a BK2 into a steel drum. no slipping. don't need no ramp. perhaps for control, or something, perhaps there's a special military reason.