I don't see your point. We shoot 4x5's for landscapes, portraits, product shots and even formal wedding shots. I would never consider carrying the 4x5 for action shots in weddings or anywhere else, however. It's a specific paint brush for a specific canvas, a suitable kettle for preparing just the right dish. There are serious LF photographers who wouldn't stoop to owning anything smaller than an 8x10, but it doesn't mean your 4x5 is any less capable a camera.
Hank