>>717108371
Mega Man X itself is purposefully vague on what the hell actually separates Reploids and Robot Masters (especially with Robot Masters becoming a lost technology at some point) and Classic doesn't help matters with rogue robots like King, Proto Man, and Bass floating around when needed for a plot
Functionally there probably IS no difference with Classic blurbs implying or directly stating that the AI technology for completely autonomous and free acting robots is already there and what's keeping it from developing is the series' own tone and the human viewpoint of Robot Masters as being utilitarian tools that have enough cognition to not need babysat or constantly repaired, Classic itself agrees that robots having expiration dates as cognitive machines is pretty fucked hence MM9's plot