User never has to manage cache space which has always been the case. Also your normal user cannot do that, without system level privileges. Third party apps where to able to call adb directly on FireTV which is not the case on other Android devices with GMS. In fact if you build Android with access for third party to call adb, Google will never let you pass CTS and you cannot have Google Play on it. It’s a huge misstep from security point for Amazon sell devices with adb access for third party apps.
Or you could provide a feature like iOS where unused apps are unloaded automatically (if enabled).
But the user should never have to manually manage cache space.