Thankyou for cherrypicking a result without any understanding.
I invite you to power-down an AVR some time and see exactly what they are capable of when drawing your mythical 1uA. Here's a hint, you can't get that power usage using a normal system clock, in fact you can't get that usage with the clock running at all, or anything else, in fact there's very few things that can wake and AVR when it's using that little power, not even the watchdog. An Internet of useless Paperweights is what you're going to have.
While you cherry pick your chips without actually figuring out if they'll do something practical I'll wait for someone to write a statement of requirements for their device first. That may show things like the only 3 IoT devices in my house being hard wired and thus no one could care less if they use 1uA or 320000 times more power.
But feel free to keep generalising.