It's not that it removes anything. It just looks like the training is based on diminishing returns and the diminishing is now at 30 points higher.I believe it's supposed to give you a nearly guaranteed chance at skill gain up to a cap of 90 but I haven't tested it. The Dojo raises the cap from 110 to 120 and also gives you an increased chance. So to me the Dojo always seemed like it made Disciplined unnecessary. Still a nice early game boost though. If Disciplined removes the caps though then that's a whole different story (and doesn't match the description for what it's supposed to do).
<<if $mctraitdis gte 75>><<set $chance+=30>><</if>>
...
<<set $chance-=$masterstrength>>
...
<<if $chance gte 1>>
...
<<set $masterstrength+=1>>
Basically this: Do dice rolls and lots of adjustments to chance, Add 30 if Disciplined, subtract strength, if end result greater than 0 then increase strenght.
Unless there is a cap somewhere that I'm missing, then it would mean that you can train 30 more points per skill, before it becomes impossible to train further.