Yaarel
🇮🇱He-Mage
Maybe make it obvious to Paladins when other planar creature types are present ... and just as obvious to these extraplanars that the person radiating a Paladin aura is a Paladin.Hmmm, I am just now realizing that this may be a holdover from previous editions, but we play that when you use Divine Sense it is obvious to everyone who sees you that you are calling on your god or whatever to grant you this sight - so - for example - it is gauche to do this at an audience with the king or at a noble ball or other social situations or negotiations requiring trust. So the passive thing won't work for us.
But I get what you're saying about it potentially being annoying if someone does it all the time - but taking actions of this kind all the time does have potential in-game consequences.
The Paladin too would have an Astral aura, namely the divine power source, and actually similar to the auras of Celestials and Fiends.
The Paladin, depending on planar affinity (rather than alignment, per se) might actually have a Celestial aura or a Fiend aura, or whatever aura it is that Neutral Astral Planes have (LN, TN, CN, are they Elemental?).