I heartily agree with this. Sadly, it isn't about what we want, it's about what SE wants for their game. Yoshida has said in an interview that he and the dev team have decided that one person being able to craft everything and gather everything is a bad idea. They feel that "can do everything" has turned into "must do everything to do anything," which they find very daunting to new players. Their solution to this is to limit endgame crafting and gathering like desynthing is limited, by forcing players to choose classes to focus on. I honestly don't get how that changes anything, as it doesn't alleviate the need to level all crafters for their cross-class skills, it just means that you now can't do anything with those classes you spent all that time leveling. To me, that makes it MORE daunting to new crafters, not less. But, I don't work for SE, and they disagree with me.
This is why I do not believe they'll open up desynth more. That's not the way they're trending. They're trending toward one character, one class in each discipline.