I mean not the entire pieces, but for developing the technique for those pieces.
I've thought that mastering Chopin in general, never mind the etudes, is rather an oxymoron. There are so many flavors of expression, when can you really consider it ( a given piece) mastered ? At least with Bach there is a tangible pathway, it may be twisted and mess with your head as it does mine but it's written there in front of you. He left some head room for expression but it's different than Chopin. With Bach it's more about the accents and offset voicing/multi voicing. With Chopin you have to color the musical expression and bring up a sense of warmth in yourself and hopefully your listeners.
Horowitz said to be great at Chopin you have to play Mozart and I believe he said to play Mozart you have to play as if it were Chopin. He didn't mention Bach in this little statement. Bach, again, is different. I always thought if one has a high mechanical aptitude and mathematical aptitude they should be able to figure Bach out fairly well. With Chopin it's more about emotion and that comes after you get done with the Jungle Gym of notes he presents. To become a master at that is something perhaps that may end up way down the road. The word "master" has a lot of meaning.