That seems incredibly unsafe to me. I was expecting them to have some kind of brackets to hold the back and seat together, do they have that, are they assembled differently like with hinges of some kind, or don't they get assembled at all? Are the seat and back just two solid pieces of plywood? How are the bolsters made, are they just plywood also, or are they more substantial than that? It seems to me they would have to be stronger.
No one lives forever, the trick is creating something that will.