Chris, understand your point of veiw, as I used to be a career Firefighter for a couple of years before going back in the Army and then subsequent PSD work is Iraq. Easier to unlatch the seatbelt in a civlian setting accident, though there are times due to the accident configuration where a seat belt cutter came in handy. In a war zone, you may not be able to access certain angles of the vehicle due to gunfire, and also IEDs can really tear up a vehicles, so a Seat belt cutter may be needed. Also, you may have to use one yourself to get out. As the seatbelt latch can be damaged in the accident or explosion and team members from the other vehicles in your convoy are occupied with other tasks at the moment. Most IEDs also bring about fire damage as well, especially EFPs. Plus weapons, tactical wen gear and body armor have a way of getting tangled up in seat belts. Our SOP was to always wear Seatbelts, though some did not like, it personnally saved my life in an incident I was involved in, in Iraq. Had the armored F350 I was in get flipped over several times and thrown into a ditch. (not due to an IED, but to a non-detonating suspected VBIED ramming my vehicle) Many times in an IED explosion, it was not the blast that killed personnel, but the subsequent rollover of the vehicle and accident that the IED blast caused.
The EMT shears are great for cutting off webbing, gear, clothing. And also cut through seat belts pretty good.