That's hard to get my head around--"perceptual awareness to see and understand the caves in MX ...." Is that like being super-observant of the cave's features? If so, are you saying that learning not to be a line hugger by being super-observant/aware is something that MX training emphasizes? ("Learning the cave" as opposed to merely following the line was mentioned in my FL Intro course as being a skill to develop, but not expected of me to demonstrate in the course itself.) How much perceptual awareness can one develop in a 5 or 6-day course, anyway? Wouldn't that be a skill that is mainly acquired over multiple dive trips to MX?
@kierentec pretty much nailed this answer. Basically most students in FL are pretty focused on the flow, how to get out of it. "Reading" the cave? Not so much.
In MX you have a whole lot less work, CO2, less depth and shallower END. But there are far more jumps, some poorly marked and close to the mainline, there are no or few caves with arrows every 100ft etc. Basically you need to be looking around a whole lot more - including back the way you came to recognize the exit. That kind of awareness isn't as much of a focus in FL with more linear systems where flow takes you home and there is giant gold line and almost no tricky accidental jumps you could take.
Also, since Full Cave focuses on navigation, wouldn't the increased complexity of MX be an advantage over FL? Or is that backwards--you want to learn navigation where it's easier?