I mean changing Ki to Discipline forced WOTC to focus the monk into a stronger archetype due to the less overtly magical base.I'm still confused at how they are "losing ki" as they have more points and do more things than they did before the name change
The monk no longer turns invisible, astral project, speaks every language and doesn't age. They can't if go from the "mystical energy of ki" to the "extraordinary energy within themselves".
The monk pours their training into their body and mind to be a master warrior.