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So if the Macbook 2018 suddenly uses intel 80386, slow FP operations are also Intel's fault?

No. Apple decided between adding more, but more power hungry memories and battery life. 16 GByte memory was deemed ok for most of all users and battery life became more important.

Design within the limitations and handling market requirements in short.

No, they chose between performance and thinness. Battery life would have been fine with a battery the size they used before.

Please, read this before commenting: https://en.wikipedia.org/wiki/Mobile_DDR

XPS 15 uses DDR4, is even thinner if possible than the MBP and has less than 4 hours of battery.

IMO MBP should be performance focused, being battery life a secondary concern, while keeping MBA as an ultrabook.

In any event, it possibly cannot be Intel's fault if Apple makes the hardware decision.

No, it can't be. Intel provides their best products as given by their constraints, goals and customer demands (and Apple is a big customer). Apple releases the best products based on their goals, constraints and customer demands (as much as Apple now listens to them).

Each one to their own devices, so to speak.

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