I'm... clearly not parsing any of your statements correctly. As I read it, one of things the linked IETF BCP document does is to implore authors and configurer

I'm... clearly not parsing any of your statements correctly. As I read it, one of things the linked IETF BCP document does is to implore authors and configurers of TCP software to ignore and pass through -unchanged- TCP options that they don't understand, rather than to consider them invalid and abort the connection. Did I misunderstand the linked BCP?