Pretty wild to me that the Cortex A53 is a decade old & barely modified in it's newer forms. It's so hard to imagine so many years & a microarchitecture remaining so unchanging.
By compare Intel's been making small but OK revs to the Atom cores. And the new E-core on the new n100 replacement is monstrously faster, yet still small. A potential core-m moment for Intel, a great small chip that expands.
It's a shame, because it was the best design from ARM; they're now focusing on Cortex-A7x and Cortex-X, which aren't anywhere as power efficient[0].
Meanwhile, their revised Cortex-A57 has been surpassed in performance/power/area by several RISC-V microarchitectures, such as SiFive's U74[1], used in the VisionFive2 and Star64, or even the open source XuanTie C910[2][3].
0. https://youtu.be/s0ukXDnWlTY?t=790
1. https://www.sifive.com/cores/u74