Since 3rd edition, my take is that my character is not smarter (or less smart) than me. He might have a better memory, spot details better than me, make his spells harder to resist than mine, but the character is as smart as I am.
Similarly, i can decide that one of my character’s traits is having a short attention span, or having a hard time grasping complex problems, or have a preference for simpler plans, but the character won’t be less smart than I am.
i encourage my players to do the same when I DM.
I would hate to play at your table. Many of my characters have different levels of intelligence than I have, but, whether they are smarter than me or not, to limit them to my "type" of intelligence cheats both me as a player and the character as a being in another world.
Personally, I have no knowledge of magics, psionics, fantastic creatures, or anything else found in a medieval fantasy world. How could I?
My IQ is 159 but that would be worthless in such a world, as it is only in reference to the world I, my real self, live in.
Neither do I possess telepathic powers to see into the minds and imaginations of my players/dms.
This lack of "real-world knowledge" of the world in which I play limits all my dealings within said world.
As a DM, I encourage my players to do their best to figure out what they can using the books or materials which describe the world we play in, but when a situation arises where intelligence is a key factor, I encourage them to ask me what they know. A simple intelligence check against an appropriate DM will tell me how to let them know how to respond.
If the check is a success, I simply tell them the details they need based on the details the character should be able to piece together. If it fails, I simply stare that they do not know or, if it's a close call, that they just can't seem to put their finger on it at this time. I tell them, "it escapes you at the moment, so you let it go for now." and if they later succeed at a recall roll on the same subject, I tell them, "you realize what it was you could not recall earlier and using this new idea you arrive at <a particular conclusion>.
To do as you suggest makes every one of your PCs the most highly intelligent beings on your world, or all the stupidest as you simply relate equally to everything and everyone around you. Not realistic, not fair, not fun.
That is just my personal thoughts on your idea as I understand your statement. If its working for you and your people, stick with it.
Cheers.