Lower power CPUs are very powerful nowadays. Like the one in your phone - it sips power and can do what a full server could do a decade ago.

storage has also increased (thus, its management overheads).

And, to be honest with you, I’d prefer phones that are battery powered get the 3nm process node and these kind of devices lagging on 7nm or whatever, since they have the capability to be powered from the wall, and you can have less consumptive cpus taking a larger spaces making a bit more heat/power per cycle: but since you need less you can get away with it.

Not everything can be 3nm or lower, the yields aren't good enough.

What I care more about is ECC.

The rumoured Apple server (for their use, not for customers) makes me sad. I want one.

Apple silicon with some other os would be an amazing low power nas.