Abbreviated views should show abbreviated date modifiers, not bare years
Trees and other abbreviated views show modified dates ("before", "after", "about", "from ... to ...") as bare years. People keep using this fact as a reason to advocate against using modifiers. I disagree: I think modified dates can be quite useful, and the fact that they look like unmodified dates in abbreviated views is a fault of those views, not of the modifiers.
I think abbreviated views should use abbreviated modifiers. Use a tilde (~) for "about", a less-than sign (<) for "before", a greater-than sign (>) for "after", and a slash between the two numbers for "from-to".