I wouldn't say that's necessarily the actual situation. There are a lot of lumbar supports that are adjusted sub-optimally. I've NEVER succeeded in getting a passenger to adjust the lumbar support in my Model 3, except for one time my wife played with it. But she didn't know how to adjust it. In most use cases it's better for the shape of the lumbar support to be adjusted to a standard shape than to have it capable of being adjusted to a sub-optimal position (because most people have no clue what is a good or bad position until it's too late).
Remember, this is removal of the manual adjustment mechanism, not the removal of lumbar support, the seat will still have excellent lumbar support for people with relatively normal spines. Even Ekornes Stressless recliners costing thousands of dollars and well-known for their ergonomic comfort do not have manually adjustable lumbar support.