I presume it is due to the little spell thieving bards (such as myself). Magical secrets at level 10 can snag a spell from any other spell list, so 5th level paladin spells are on the table for bards. in the table top, my bard ran around with a number of paladin exclusive spells. Thankfully, no paladin in the party to get jealous.
Implementing a Paladin spell so that it can be used by Bards but not actual Paladins is next level class favouritism
