Following D289 we can see relics in the top panel. In order to quickly lookup their contents, it would be nice to display them quickly.
Same is true for the other relevant entities displayed there, like heroes or wonders (once they can be added from trigger scripts, so it would work for the treasure seeker female too).
This somewhat helps with the use case of D294 but one could also argue with the hammer-nail argument if one isn't fond of those units.
(This still doesn't allow comparison of all existing relic units, but allows the player and observer to lookup the auras quicker than selecting it and hovering the icon to see the tooltip)