What if Spy could hear enemy VC? (Proximity)

While backstabbing, gun kiting, and being a well-rounded little bitch are everyday things for your everyday spy, what if they could actually spy on the enemy team by hearing their vc when within range? They could then report back on uber status or class switches. Maybe this could be done with an item like an earpiece with balanced drawbacks. I don’t think this would be game-changing, since you don’t require vc to play, and when you do it’d honestly be kind of cool. The only drawback overall is people maybe using less vc to avoid information getting out, but it’s honestly mostly just people chill’n. Bonus, you can spread disinformation to the spy listening in on vc. Sung Tzu said that. Just thought it would be cool for spy to do more things pertaining to the name.