alt Hacker NewsFor everyone who says that the Alpha was a technically-superior CPU design that should have prevailed, I will draw attention to an interesting fact:
"According to Allen Baum, the StrongARM traces its history to attempts to make a low-power version of the DEC Alpha, which DEC's engineers quickly concluded was not possible."
https://en.wikipedia.org/wiki/StrongARM
While AArch64 has been in the top supercomputer, a phone running on Alpha was not.
For this scalability problem, it deserved to die.
The issue was not that Alpha ISA was impossible to scale down.
The issue was that DEC lacked the resources to run a completely new microarchitecture design to target low-power platforms, and the failure was trying to push an extreme performance chip into low-power envelope instead of designing a new one.
AFAIK with ARM the difference is that they started with low-power underpowered chip and modified it to bring the performance up.
You'd have probably similar issues trying to make a phone using Fujitsu A64FX (the supercomputer ARM) into low-power chip.