Worth noting that these characteristics generally hold for most cob bricks as well. It doesn't seem like it's particularly special because of the seaweed except that it's a way to use an abundant resource. Significant imo because of the minimal treatment necessary and lack of ecological harm in construction.

Wanna renovate? Wanna expand your building? Wanna take it apart and rebuild it entirely? It's basically just dirt so it's flexible to future growth and needs with minimal costs. The West tends to build buildings as if they're permanent but of course even skyscrapers need to come down eventually. All that glass, plastic, and even stuff like asbestos previously, is eventually gonna be taken apart. Usually mostly dumped to a landfill