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Adding a 48V mild-hybrid isn't just a bit of fuel savings. It actually is up to 15-18% less fuel consumption in the European emmissions test. That is quite a lot, the EU has decided to reduce the emmissions up to 37.5% until 3030. That is a lot and can't be acomplished by optimizing ICEs. In order to reach that goal, companies have to introduce (mild) hybrid systems and have to boost their sales in PHEV/BEV vehicles. That's the reason why BMW (and Audi/MB as well) are now offering a lot of hybrid engine options. It's not only because the market wants them, but because they have to sell them to keep down their emissions, otherwise they have to pay hefty fines. In Europe BMW/Audi/MB are offering incredible incentives on their hybrids.
The ISG of the mild hybrid system allows the car to completely turn off the engine while driving (gliding). Additionally I think people won't complain about a higher MPG.
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