If we want the brain to be an input device then we must treat it like an input device. That means interfacing with it with the most modern/common standards we have, which, for better or worse (mostly worse), is currently Bluetooth.
Do you also think it's weird that people can put on VR headsets to alter their sight, or put in AirPods to subvert their hearing? 'Cause it is, but I think we've all normalized it to the point that it feels like something we're allowed to do. I think the same will happen with Neuralink at quite a fast pace.