As a Roblox developer, it is currently impossible to prevent ProximityPrompt | Roblox Creator Documentation from being shown to specific players only.
If a player, for example, is not allowed to interact with a door, then the prompt should not even be shown.
However, ProximityPrompt | Roblox Creator Documentation can only be manipulated in LocalScript, thus being subject to tampering by exploiters
If Roblox is able to address this issue, it would improve my development experience because depending on the game, I could prevent the ProximityPrompt | Roblox Creator Documentation from being shown to an unauthorized player, depending on the blacklist/whitelist.