I can't agree with that. Does Propilot drive itself? Has the interior finally made into the 21st century?
The BMS issues have been fixed and certainly won't be found on a car bought from a dealer today.
No driver assist drives itself in the EU or the UK. Not allowed. All they do is keep lanes or change lanes, adjust speed.
The MG BMS issues may have been fixed but there is plenty of time for new issues to arise. These are issues that the Leaf did not have straight out of the factory. Sure enough, the Leaf has had its issues, but it has gone through the leaning curve and taken action where needed.
EV's have lots of expensive components whose useful life can only be measured after they've been through an entire lifecycle. Motors, reduction gears, batteries.
Then EV's are also cars and that means a whole lot of other things that can go wrong: rust/corrosion to the body and other parts, water ingress to the electronics, condensation in the lights, fatigue to mechanical parts, deisgn flaws, etc...
The Nissan Leaf is a car that has ben through an entire lifecycle and has withstood the test of time, also being abused as taxi's and such. The i3 is getting there.
The MG is not only new to the EV game, it's a new car manufacturer that is using an old badge.
Tesla has shown that there is a huge learning curve about becoming a car manufacturer.
There is a difference between buying an EV and owning an EV.
You may be happy about your MG ZS today, the only relevant thing is whether you will still be in 5 years.
Being happy about a 1 year old car is a lot different from being happy about a 9 years old car.