Why should a Rogue Sage be better at Lore skills than a Wizard Sage?
Because Lara Croft.
Why should a Rogue Sage be better at Lore skills than a Wizard Sage?
You're just stating how it is as justification for it being that way. Why should the rogue be the "skill expert?" Skills are something everyone has. Why should rogues be better at it than anyone else? They have many other niches they can fill that are far less boring and controversial.
The DC guidelines say examples of DC16 actions are "Pick a typical lock" and "Cross a wildly swaying rope bridge".
I do not see those things as being beyond the ability of a typical rogue. Yes it's powerful but not too powerful for my tastes.
They have many other niches they can fill that are far less boring and controversial.
It would be cool, for example, if they let rogues trade sneak attack damage for special attacks the same way fighters can give up combat superiority dice. Things like inflicting Bleed damage, blinding foes, disrupting spellcasting and other dirty tricks are things I'd like to see them be able to do. I'd also like to see them get choices of other cool special abilities, like evasion, hide in plain sight, disguise, forgery, and use magic device, to name a few. Those things are, IMO, alot cooler and more distinctive than "I can take 10 on any skill!"
I'm sorry, where does it state that rogues get two backgrounds?