Well andymags
On a couple of points you could be quite right the problem according to Tesla UK it is the MG protocol and safety that is the problem, and Tesla supercharging is apparently very reliable and fast I know this for sure as I have been able to use one with my wife’s MG4. Brilliant.
So now where you are totally wrong, the charger does not need to know what car is plugged in if it did they would never have open their chargers up to any make or model of vehicle, payment is made via the Tesla app or in the case of the newer V4 units,via the app or credit / debit card if you like,
How long it can take to charge yes depends on the vehicle to a degree and it’s state of charge when you plug in, the same can also apply to Tesla's cars as well in fact any EV.
And the idea is really to charge to a certain point and be on your way and that applies to all cars you say your car is able to charge at 76kW but you have only ever seen 32kW dealer visit is due I think with that issue, my MG 5 as been up in the high eighties several times when on a journey from a low SOC.
You say Tesla should block all MGs so from that statement they should never have opened there network according to you, so when you see a row of superchargers not being used that is revenue lost on investment as far as Tesla is concerned, you won’t see that often but believe you me I have sat and waited on more that one occasion waiting for a gridserve unit when Tesla units where empty which is one of the reasons why this thread is trying to get to the bottom of this issue and hopefully get MG to change its protocol and fix any safety issues if there are any.
Les