Best practice for deactivating events, tracks, sessions, and enrollments

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We have a number of events and tracks that are no longer valid. I know when I deactivate them, it also deactivates the associated sessions and enrollments. Aside from changing our report parameters to look for both active and inactive sessions and enrollments, are there other implications to deactivating events and tracks that we should consider?

Also, what is the best practice for enrollments that are complete and in the past? Should those be deactivated?

The overall question is that we're trying to figure out the best way to keep our system clean and clutter-free.

Thanks!