Actually my current machine is 5.5 GHZ with 28 cores but core count only really matters if you have a lot of parallel workloads. Most of my CPUs are idle the vast majority of the time. Raspberry Pi 5's 2.4GHz Quad core doesn't seem so far behind when you consider the physical size difference.

I remember programming ATMEL ATMEGA8s and being amazed as how much I could do with them, so to me, the fact that devices of that size can approach even half the clock speed of a cutting-edge computer, and have multiple cores, is mind-blowing.