I doubt that Charlie and Julianne have told the press the full story.
Maybe Julianne would not commit to 2022? Has anything been said about that.
I'll add that I really liked S/B and thought they had loads of potential - fully expected them to dominate in Canada for the next quad.
Julianne said in one of the post-split interviews that she is still looking to compete in 2022, so that obviously was not the issue.
I am sure there is more to the story than they are telling (although I don't think it was some big dramatic issue - more like not mentioning specific problems in training this summer, etc.), but the fact that Julianne is telling the press that she was pretty much blindsided by the decision and that she is still trying to figure out what happened and why suggests to me that this was very much one-sided and probably the result of a lot of small things rather than Major Issues that they both would have known about.
To all the posters above who are criticizing me for not "respecting" Charlie's decision, it isn't that I think he should have stayed in the partnership if he seriously thought that their goals weren't compatible anymore or that they weren't progressing as he would have liked; it is the fact that (at least from what is being publicly said) he was clearly thinking about this for some time, but instead of having the grace to speak to his long-time partner about what he was thinking/feeling, he sprung the news on her suddenly after their competitive year already seemed set and did not really seem to discuss his full reasoning with her. If he was thinking about this since after the Olympics, why not sit down with Julianne (and possibly their coaches) and say, "This is what I'm thinking and feeling; knowing this, would you rather part ways now before we start serious work for next season, or do you want to have a trial period of ___ weeks/months where we can both see where our training is going, seriously evaluate our options at the end of that time, and accept the decision if one of us wants to part ways at that point?" At least then she would have an idea of what he was thinking and would be able to at least have some say in the decision, knowing that accepting a trial period might mean that at the end of it, they would part and she would have lost training time/money/etc. She would not be lost wondering what happened and why she was suddenly not good enough.
People can bash me all they want, but from all the interviews they have given so far, the decision comes off as selfish and poorly managed to me. "I want medals and I decided I need a new partner to get there. We had a good run, but it's too bad, I made this decision for my future goals and that's the way it is." Even the way he is speaking to the press saying things like, "I felt we weren't giving each other what we needed and that we were going in two different directions" sounds like these are things he did not discuss with Julianne. Of course, it could be possible that she is playing the victim in the press by saying things like "I don't understand and I need to take time to figure out why this happened", but it really doesn't seem like it, IMO. Sure, you can hold the opinion that selfishness is needed and even necessary when trying to reach lofty athletic goals, but I think one can work towards their goals and make tough decisions while having a bit more decency and compassion for the people who have to face the consequences.
Again, this is just my take on it and people trying to read my mind by saying things like, "If he had done this-and-that differently, you probably still would criticize!" (

) aren't going to change my mind.