I had the same view regarding Model 3 single screen and speedo in the center until I got a Model 3. Now I absolutely love the setup with one screen and prefer it over current S/X with two screens. It just easier and more logic with everything in one location (when you have adapted to it).
Many who doesn't like the Model 3 setup just have decided beforehand that it is a bad solution and probably haven't tested it in real life for a period of time. Everything takes a bit to get used to even if it is better.
It's like rebuilding the local grocery store. The old customers who have shopped there for 10 years initially complain because they can't find the milk or the tooth paste. But for a new customer it makes more sense and is more logic with the new store setup. After some time when even the old customers adapt, the new store layout turn out to be much better.
I really hope they copy the Model 3 setup into Model S/X update with the horizontal screen which I find better from a ergonomic point of view and I don't understand why I want to look through my steering wheel to find information? And to be honest I don't see the point of a HUD either. It's just a distracting light cluster in the windscreen that 99% of the time render useless info that I don't want to have in my line of sight when driving.
To those who is negative about the one screen setup in Model 3. If you was forced to use it for a couple of weeks I'm sure you would change your mind and realize that it is a great solution. This was the way for me at least to convert and now i prefer it and it feels strange each time I jump into a car with redundant info in HUD, behind the wheel and a third (or forth) screen in the middle console
Tried it multiple times over the course of several weeks. Still don't dig it.
I mean one will get used to anything eventually, that's how things are in general