Given that, the only way to be safe is to be redundant. Everyone should be using at least two back ups in separate secure locations. Because I do this, I am unconcerned if I lose one back up due to fire, corrosion, or similar, and so I do not feel the need to use one of these metal devices. Laminated paper in an airtight and watertight container is good enough for me.
Having some kind of "steel" or fire/crush/water-resistant medium to store your seed is fun, but I am afraid these types of products will discourage people from having off-site backups, which is what really provides security that people will not lose access to their seed. For many people, a wildfire will mean that a location will be inaccessible for months at a time, and there is the risk that houses will be looted. The same is generally true for hurricanes/severe floods. A severe flood may also physically move a medium documenting a seed, and it may be difficult, if not impossible to locate the medium, even if it survives.
IMO, it would probably be most appropriate for most people to keep a paper copy of their seed in a fire safe in their home. They should also keep a separate copy in at least one off-site location. If the area they live in has a particular high risk of flood and/or fire, the off-site location should be particularly far from their home, idealy inland.
