I think you are reading about Kincaid’s wood furniture, not their upholstery. It “unitized frame construction” which means plywood, and here’s their cutaway, which is fairly typical of mid-grade domestic upholstery. The wood in the build is obviously rough plywood.
Attachment 13754
95% of all upholstery furniture today is made of plywood, terms are used to avoid saying that, however. Frames almost never fail in any brand, it’s pretty much a non-issue, it happens about as often as it rains frogs. Plywood is the industry standard and there are different grades, types and thicknesses used. Based on the cutaway shown, this is unremarkable construction.
Suspension and cushion construction are more important. 8-way suspension is the gold standard, and good foam is expensive. When a sofa fails it’s due to suspension collapse or cushion loss of resilience. Or the fabric simply wears out.
Your husband has set the bar low based on price, and that’s the worst way to buy a sofa, but many do exactly that. In upholstery, you usually get what you pay for. Good luck.