DND_Reborn
The High Aldwin
Isn't that the entire point of being a skill monkey class? You don't get powerful, auto-success abilities like spells, but you have a high chance of succeeding on mundane skill rolls.
Being a skill monkey can be accomplished through other means. Also, it shouldn't be the bright star, so to say, for either class IMO. Also, bards are already the true skill monkeys via Jack-of-all-trades.
Otherwise, I also like the idea of limiting rogue expertise to skills from the rogue class list.
Allowing bards, who can selected any skill as a class skill, to choose expertise in anything is more appropriate at least given the nature of the class.
Granting players the choice of expertise from a background skill by sacrificing the other also removes problems, as does deciding to use the UA skill-feats and expanding Prodigy to all races.