Critical sheets include all customizations that make use of the bundle components. You should make sure you are aware of what these bundle components are doing and analyze the risks of removing them.
Specifically, you should review the customizations from scenarios 3 and 6:
- Scenario 3: are non-bundle components that are used by bundle components, so there may be fields that are set by scripts, workflows or searches that belong to the bundle.
- Scenario 6: are non-bundle components that use at least one bundle component for something, so their functionality and/or display may be broken.
Non Critical Sheets
Non critical sheets include all the customizations from scenarios 1, 2, 4 and 5.