It is, in fact, already used by everyone, because it's an evolution of the chipset in basically every smartphone in the world with widely divergent target audiences, income brackets, and technical limitations.
In particular, this is the first 5nm chip to be widely available, and by most accounts on performance it competes with top of the line hardware at a small fraction of the power use. Most existing ARM chips are designed for the very-low-power market, e.g. in phones, not to be used in a high performance laptop.
If there's a Dell or Thinkpad laptop with an ARM chip that's comparable, by all means, let me know.