Disbursement contribution approaches are concerned with how knowledge, priorities, ideas and contribution information is submitted into the disbursement process - https://disbursement.treasuries.co/disbursement-approaches/contribution-approaches
Independent submission processes helps contributors by reducing the time required for them to participate, making it simpler to make submissions that can add value and making the process more expressive so that the full range of ways someone might want to contribute are possible.
An independent submissions approach can also help with:
Increasing the flexibility of the system to experiment with disbursement decision approaches
Increasing the opportunity for collaboration & feedback
Enabling contributor specialisation
Increasing the information flow & response speed
Enabling contributors to immediately start building reputation
Results in a better data structure for increasing usability, composability, reusability & maintainability
Any thoughts or feedback welcomed 
Catalyst should ideally be implemented in a way that allows for independent submissions so then it is easier for the different decision approaches can be more easily experimented with in the future.