This thread is really baffling to this Dutchman. All houses have a house-wide residual-current device here; it is not a topic for debate at all. And indeed, these don't false trip.

US electrical wiring always weirds me out. Cables run through walls without pulling them through hard plastic conduits and sockets that look like something designed seventy years ago. It's probably a matter of perspective, but it seems like such a completely different approach.

Those hard plastic conduit are not providing much in the way of mechanical protection. wires in studs works pretty well, really.

Whole-house GFCI is a good thing, but we should be careful to consider what you get for that. In order for GFCIs to coordinate the whole-house device is going to trip at a relatively high current. This is definitely on the edge of what will disrupt the heart of a person. American GFCIs are often at the device level on the outlet, so they are more error prone in terms of spurious trips but they are also much, much safer because they are substantially more sensitive.