I think the logistics are very complicated especially in the current climate. Manufacturers are entirely at the mercy of the quality of the skilled workers they have available to them on the factory floor at their facilities - domestic Chinese brands such as NG and the like are at a significant advantage in many ways especially with regular direct supervision, for which companies based externally in the USA etc., has been negatively impacted by Covid with access to their factory sites being significantly restricted. A bit of a 'while the master's away' situation