For that a single cable would be enough, we where told(maybe to hard of a word) convince it will cool the device and it will use dark magic to make it better. Now we have a device that cant use BT headphones and controllers are not working properly when too far out.
Nintendo never said you could use Bluetooth headphones in the first place, it was a translation error from an interview.
As for the joy cons, am sure it's a fixable issue, likely just needs a patch but not great that Nintendo haven't come out and said anything.