Maybe but plenty of German cars around the same price bracket do not have lumbar support, instead is an option. For example BMW charge £265 for lumbar support on the base X3 costing £39k. This is still true of the X3 Xline at £41k and even the £43k M-Sport version
Lumbar support on the NX is F-Sport and above by the looks of it, but Ive never found the standard seats to be uncomfortable on any Lexus