No other Muslim country imposes these kinds of restrictions on its subjects as far as I know
Then Sir you do not know much. It is standard practice and widely publicised in all Gulf States that no-one (whatever their religion) should eat or drink in public during daylight hours. And your car is considered to be public.
It's many years since I spent a Ramadan in Riyadh and it was definitely not as you describe. In fact even outside Ramadan shops and restaurants closed and evicted customers at Prayer times.
Ramadan in UAE is NOT unusually restrictive. And you can enjoy an Iftar Snifter if you wish - unlike in Qatar & Bahrain.