its a mystical skill taught separately it isnt all encompassing to the whole of MA.
that's like saying wrestler is better skilled trained then a Boxer, its two different focus on fighting neither having anything to do with the other.
look at it this way Moondragon was a trained MA's as well and through her training she learned meditative techniques to become a world class teleapth does that make her better skilled then IF or what about Gamora her knowledge is galactic level shouldnt she be a chi master as well.
how about cap and logan they know every MA on the planet or majority but dont know Chi which is only a specific type of training.
or what about the hand these guys know magic through MA and other stuff but they are no better physically trained or skilled then anyone else. they just know those few magic moves and are still mediocre in combat both physically and skills.
mastering the use of chi does not make you anymore or better skilled then the guy who has only studied and mastered other arts that does not know or use Chi.
otherwise Dr. Strange through the use of magic is a better Martial Artist then everyone else since his knowledge will be assumed regardless of his one sided training.