> Meanwhile, gasoline / petrol / benzin (wherever your are in the world) has an energy density of 12200 Wh/kg.
Yeah, and yet, if you are talking about cars, you are bound by the Carnot efficiency, which is at most 35% no matter what(in reality more like 20% or so). Now gasoline goes to 4270 Wh/kg even assuming the best possible engine. That's without accounting for extraction, refining, transportation losses.
Yes, still 10x more. However, you don't really need 10x, as electric motors are way more efficient (85 - 90%).
The long range Tesla Model 3 only requires a 75kWh (72.5 usable) battery for a 450km (~279 miles). In other words, it uses 161 Wh/km .
> ICEs are real technology
So are EVs. For all the tech they tend to have, it boils down to: Battery and electric motor. There are some pretty reliable solid state electronics to monitor and deliver power, but that's all you really need(even the 'charger' is optional - and for quick charging, it's located outside the vehicle).
You could theoretically use decades old technology to control the amount of power delivered to the motors - so you could see with your naked eye. And, in fact, we have done that! The first cars ever designed were electric, battery tech just wasn't there. It doesn't make sense to do that in this day and age, electronics driven by software work better. We would replace ICE engines with solid state components if it was possible.
Now, for an ICE car, you have valves. You have a crankshaft, controlling said valves (and tied to pistons) - hundreds of moving parts right there. You have spark plugs (and a coil to generate the voltage). Air filters. You have an alternator (usually driven by a belt). You have water pumps (optional on EVs - and for the battery only, when they are used). You need fuel pumps. Fuel filters. Radiators (because of all the engine inefficiency). You need oil - and replace said oil, as well as the oil filter. You have an exhaust with a catalytic converter.
Each one of those things may break and some are even consumables. So much crap EVs don't have.
And you still have software and the tiny electronics you can't see with your eyes ! Unless, of course, you still use carburetors (which add a few hundred more parts each).
EVs are much, much simpler. And more reliable, less parts and most of them don't move. The only thing that degrades is the battery. For now. I drive a Leaf, which is notorious for having no battery thermal management, and degradation is minimal.