You seem to be operating on the assumption that an ARM CPU can match an x86 CPU in performance clock-for-clock.
While this may be true, it is not necessarily. Just pull out your old 4GHz P4, and see how it stacks up against your modern 3GHz desktop.
The point being architecture has come a long way for x86, and even if they match frequency, ARM will not necessarily come out of the gate capable of matching that.
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You seem to be operating on the assumption that an ARM CPU can match an x86 CPU in performance clock-for-clock.
While this may be true, it is not necessarily. Just pull out your old 4GHz P4, and see how it stacks up against your modern 3GHz desktop.
The point being architecture has come a long way for x86, and even if they match frequency, ARM will not necessarily come out of the gate capable of matching that.