I've GMed plenty of RPGs with knowledge-type skills: 4e D&D, Burning Wheel, Torchbearer 2e, Agon 2e, Cortex+ Heroic, Prince Valiant.If you're going to allow players to spec into "knowing stuff" as a character building resource, then making that choice relevant requires locking information behind it.
I've had players play characters in those games whose principle talent is knowing things - eg in 4e D&D, an Invoker/Wizard/Divine Philosopher/Sage of Ages; in Torchbearer 2e, an Elven Dreamwalker whose strongest skill is Loremaster.
This doesn't mean that I, as GM, call for checks independently of the players declaring actions for their PCs.