Planning ahead is in the DNA of the Wizard. You have to make choices what to prepare based on what you know and predict about your immediate future.
What needs to happen is Long Rest being more restricted than it is in patch 5 so those choices carry weight.
Then, if you don't like those restrictions and playing a thinking Intelligence based class >> Sorcerer is for you with fun spontaneous casting and cool heritage.
Strong class identity is what makes a class based system fun in the first place. If you start blending abilities and playstyles of different classes, you might as well start cutting entire classes from the game.
Definitely.
If Larian has any sense, they will for once try to implement a much more balanced system than what has been haphazardly put together so far. Lack of balance = lack of real choice, so I strongly hope the Sorcerer will come bundled with comprehensive changes and tuning of for existing systems - such as the camp supplies. This includes making camp supplies a resource with roleplaying implications such as volunteering supplies to refugees/needy people (with further story developments at a later stage). Would really like some "good-aligned" player agency when it comes to actual roleplaying - as opposed to enriching yourself by robbing everyone blind risk-free.