I think lateral stresses (from people's feet, etc) did mine in. The seams failed, and things quickly deteriorated after that. A lot of Ikea stuff is designed

I think lateral stresses (from people's feet, etc) did mine in. The seams failed, and things quickly deteriorated after that. A lot of Ikea stuff is designed with zero redundancy or design margin, so if any part fails or weakens the whole structure is compromised.