That Wayfair scenario is very familiar to me. I had a really similar experience with them delivering a table and chairs. They stayed for a shockingly long time to assemble them. I figured it was just really hard to assemble. That was somewhat true.

However, when I looked at them, I was shocked at how shoddy the work was. Cross braces were installed backwards. Seat bottoms had huge gaps from the underlying support. Some screws were literally just missing, with parts that would just flop. A lot of this stemmed from not paying attention to the instructions, which specified really specific sequences for putting in the screws, leveling, then tightening. Those steps were obviously engineered to minimize misalignment, but this crew thought they knew better... sigh

I didn't ask for a new crew, as I didn't trust them to send a better crew. Instead I just spent a good evening redoing quite a bit of the work.