Everyone seems to think these edge cases will seldom happen. I guess they must call for a lot fewer rolls than I do.
I run intrigue-heavy games. And I run more than one game.
When my players hear about some new piece of lore, or learn about something that happened long ago, and they ask, “Do we recall knowing any more about this?” then I set a DC and let everybody roll. Often the DCs are 22 or higher. Yes, sometimes 30, but often 25 or so—this lore is little known, say, but maybe someone read about it once. What’s the point in putting resources into, say, History if everyone else has the same chance as you do of recalling the lore? Which, for DCs above 20, will be the case often, not seldom, with the new rule.