It's a distinction without a difference. x86 is not currently competitive in anything smaller than a laptop. Even in a laptop, the only reason it hasn't eaten the market is Microsoft is uninterested and Apple doesn't tell the Joker where it gets its wonderful toys.
Market forces are at play here, exactly like they were in the 90s with Intel's massive gains. ARM is making money hand over fist while x86 is getting squeezed. There will come a time where it won't make economic sense to invest in x86, technical merits be damned.
Do you have the profit margin data to back that statement up? Everything I've seen suggests that ARM is the lower-margin, less-profitable hardware averaged across all chips produced. Moreso when you count licensing costs against the profits.