I appreciate all the thoughtful answers! May I ask one follow up question - given I have 6-50 outlet and already purchased the adapter for that outlet, once changing to 50A does it matter/better to switch to 14-50 or am I fine with keeping 6-50?
It does not matter to the Tesla UMC whether it's connected to a 6-50 or 14-50.
It might be worth noting that a two pole 40 or 50 amp breaker is only $10-20, assuming you want to swap it in for your horribly dangerous 70.