I think it can generally be summarized as "In a desire to save costs, Tesla stuffed every single bit of instrumentation and input into a touchscreen. Which sucks."
Trying to operate a touch screen WHILE driving more than "just sucks" it can also be dangerous.
To make it worst the UI isn't very intuitive and is overly complicated
It's not just to cut costs, it also means they can remotely update the interface as new features are introduced or new designs implemented.
That’s cool in theory. How is the onboarding for new UI? I already don’t want to learn any new widgets on my phone, let alone a deadly tool like a car.
> they can remotely update the interface as new features are introduced
And take away "features" you have already.
Imagine you wake up one day, get into your car and realise that the manufacturer sent technicians overnight who have rearranged buttons on your dashboard, all without your permission.