The way most everyone selects, applies/fit tests, wears and/or maintains a mask renders the face/identity cover no more effective than carrying a handkerchief in your back pocket. And without fitted goggles to protect the eyes the wearer is completely unprotected. Your contention that China is responsible for this scientific and practical reality is inane ... it’s the users of the masks who are responsible for the failure of their personal protective equipment to effectively serve its intended purpose.
You are only addressing half the effectiveness of masks...the protection of the wearer. Far MORE effective and more important is the protection of OTHER PEOPLE from asymptomatic or “early effective” infectees “if” they also wear masks. Wearing or not wearing glasses affects the latter purpose not at all, and, in fact obviates the need for mask wearees to do so.