Good argument, but it is probably limited to the x86 architecture (and its contemporary grandchildren). In contrast, the OP explicitely mentions the Raspberry P

Good argument, but it is probably limited to the x86 architecture (and its contemporary grandchildren). In contrast, the OP explicitely mentions the Raspberry PI with its ARM CPU. This kind of RISC chips (more or less) secretly took over the world since virtually all mobile devices are equipped with such a SoC. It is common knowledge that these CPUs don't deliver the single core power of a desktop CPU but nevertheless parallelize. Without doubt it is worth in getting crypto fast(er) on such devices.