Note: this is related to a current mobile feature than a new feature.
The human hearing range (how high pitched and low pitched we can hear) gradually decreases over time. This has to do with the decay of certain parts of the inner ear that gets more severe as we get older. While 20 kH may not be heard by adults (cough cough Roblox engineers), it can usually be heard in kids and teens (cough cough target audience) as a high pitched, even painful sound, depending on the volume (which is required to be really high in order to use the feature in app).
The “Find Nearby Friends” feature in the Roblox app can be heard easily and is at an unbearable frequency of about 20 kilohertz. My suggestion is to either lower it out of the hearing range (less than 30 hertz) or raise it out of the hearing range (may not be possible, kids can hear up to 30 kH). Until this happens, the feature is painful and not useful as a player and developer.