The rivets do have a lower profile than bolts and if the framework structure is well thought out and riveted, then when the deck is joined to the framework a "torsion box" is formed. a hollow core door is an example of a torsion box that is skinned on both sides: dimensionally stable, flat, ridgid and lightweight.
However, after traveling to Florida to vacation (and Louisiana also...don't know about other coastal states) at a Home Depot, I discovered some stainless steel fasteners for creating a faster "boarding up" system for hurricane protection.
The bolts were 1" or 1.5" SS washer head type with a low profile (lower prifile than a buttonhead). I picked up several boxes of them and some washerhead wing nuts also in SS (I use in my workshop for jigs etc). I will use them for decking infrastructure as well as through the hull. They offer an alternative.
Bottom line is a well conceived framing system will not require excess fasteners of any kind or style and lighterweight materials can be used.