One can't necessarily conclude that (you might not agree with the linked paper ["research and evaluation"], but the ExtremeTech article itself shows what happened to Atom was complex and affected by multiple factors). It seems that it's too facile to say it was just because of the ISA.
"Intel didn’t lose the mobile market because Atom’s performance and power consumption didn’t compete with ARM; research and evaluation showed that Atom was capable of matching ARM performance in multiple market segments. It lost the mobile market because it didn’t make the changes that would have allowed it to compete on cost with products manufactured at TSMC and Samsung."
How Intel Lost the Mobile Market, Part 2: The Rise and Neglect of Atom - ExtremeTech
In Part 2 we explore the specific decisions Intel made, the rise and neglect of Atom, and why the company's superior foundry technology wasn't enough to conquer the mobile market.
www.extremetech.com
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