Sleep is such a finicky thing which requires all parts of the system to do it right.

My desktop lost the ability to sleep because I guess the nvidia drivers have decided that you are wrong to want to put things to sleep.

Looks like Framework has started heading this direction too, which is nice to see.

Apple's storage controller is not even a PCIe peripheral internally, so it's saving power and latency cutting out that interface, even when it's active.