This problem was very predictabel in 2013.
There is a strange expectation that mobile devices will follow the same path as desktop without considering the unque hardware constraints.
And for some period of time to come it most likely will get worse before it improves because the last few billion people on Earth without a smartphone will get a very low cost low performing device and represent a huge chunk of the user population.
In addition, for some time to come there is no breakthrough in battery technology on the near horizen and so no matter how many cores you add to the SOC, they will all throttle-down like crazy after the benchmark is over. Normal every day usage with some multi-tasking will actually show a worse user experience than a benchmark might suggest.
Apple has been in the unique position of innovating on a premium product for which the market realities of most of Planet Earth do not exist. The gap will widen at least until nobody is left that might buy a premium smartphone which has to happen at some point. All markets hit the end of the S-curve.
Presumably within 10-20 years there might be some sort of nano-tech battery breakthrough that will permit Moore’s Law to do its thing again…