In my previous campaign, I changed up what Magery did.
Magic items were not detected on sight - although, by touching them, you could roll versus IQ to sense they were magical.
You could, however, Concentrate and make an IQ+Magery+Alertness+Acute Vision roll to see if someone had Magery. You couldn't tell if that someone had spells or not, but yes, you could detect aptitude for magic.
This was done to change the flavor of the game - make it more like "detect the gift of Magery" and less "scan those guys and see if they're toting magic items." Especially because "those guys" meant "I walk around the city looking for magic items."
Overall it went pretty well - magic items were detected with Mage Sight primarily. Magery was uncommon but the PCs could check and see if they faced wizards or not, especially in social settings. It was a bit of a power-up for Magery since a spell replaced the other power but it fit the specific campaign well.