Should we split NWB contents to follow proper BIDS derivatives?

And eventually, if BIDS raw supports other modalities like ophys, pose, etc.

For example, should we take spike sorted data out of an NWB file and put it in derivatives?

Should we repack the original NWB files? Or just respect whatever the given NWB split convention is (if multiple NWB files per session)

Will comment more fully later