Often when attempting to understand a tough bug, I often find myself in a situation where it would be useful to get a full view of the data, far more than what is usually shown. I sometime start adding some
ShowInInspector throughout the code in order to get a better idea of what is going on.
Instead, Odin Inspector could have such a mode where everything would be shown in the inspector without failure, meaning everything that would normally have to be marked with
ShowInInspector, such as private fields and properties. There could possibly be a page in the preferences too to check off certain unnecessary things such as methods (or just private methods, for example). The mode would have to be easily accessible on a whim from the inspector itself in order to be handy to use; I leave this UX decision up to Sirenix.