Okay tub, but flimsy walls

This may or may not be a reflection of the general state of acrylic bathtub selection these days, but while this tub didn't have anything really wrong about it, I wasn't happy with its sturdiness. The walls are flimsy and bend easily under slightest pressure. I glued a scaffold made of criss-crossed wooden strips to reinforce them and added spray foam on top of it, which resulted in a much, much sturdier tub that I'm happy with. But why can't manufacturers do it in the first place? It's not that hard and I'll gladly pay more for it.