Simply, Geekbench does not measure a device's actual performance, actual being represented by real-world usage. Instead, it just tests "components of the SoC or some other part of the whole system". So, the A14 Bionic may compare to something like the Core i7-8850H in isolation, but that comparison quickly breaks down when one steps outside of a synthetic benchmark. The A14 Bionic, like all mobile SoCs, will be optimised for power consumption to a far greater extent than the Core i7-8850H will be, for example. In practice, this means that the former cannot maintain high clock speeds for as long as the latter can.
In short, benchmarks like Geekbench offer a snapshot of what SoCs can offer in an ideal scenario. They cannot offer a worthwhile comparison between architectures like ARM and x86, nor are they intended to do so. Implying that the A14 Bionic matches the performance a Core i7-8850H ignores any restrictions that are placed on the former, whether that be the other hardware with which it is paired or that is passively cooled.
Undoubtedly, mobile processors are closing the gap to their desktop and laptop counterparts. Hardware is only one part of the equation for ARM processors to offer comparable performance to x86 chips, though. As we have seen with Windows 10 on ARM and devices like the Surface Pro X, software optimisation plays a huge part in how powerful a device and its processor feel.
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