LSA seaplanes are a segment all to themselves. [See Breaking News at bottom!]
It isn’t only that seaplanes can offer “triphibian” capabilities (a term once promoted by MVP) because they can operate from land, water, or snow. That makes them versatile but amphibious craft must incorporate retractable gear and since they require a sturdy hydrodynamic boat hull as well as aerodynamic aircraft structures, the engineering task becomes significantly larger than land plane designs.
Icon took years with their A5 and Vickers is still working on their Wave. Both took more than a decade to reach market. Several other LSA seaplane projects required