I think the users at large never cared about clock speed and the hardware reviews mention it, simply because it gives a hint at how the performance gains between generations are produced. But since you can't buy an M-chip with a higher clock speed, or overclock it at own risk, it's a moot point. And no, Windows and Linux users do not count. Apple doesn't sell toasters.
User base "as a whole", not just the small percentage of the personal computer user base who own a Mac. As a whole, the INDUSTRY still focuses on clock speeds.