This should work much better than it does. Microsoft is right - Windows machines should be able to run background services as well as a tablet or phone.
Their Modern Standby requirements should have included a clause saying that the machines efficiency core (which I assume is what would be running in standby) should not be able to raise the temperature enough to require a fan.
No, Microsoft did not ask the users if they wanted this or not (or made this behaviour configurable). Just as they did not ask users if they wanted to see ads in their Start menu...
It works well on mobile devices because from the get-go, it is established that the operating system can aggressively suspend or halt processes. Laptops + PC's, on the other hand, have 40+ years of legacy that assume that the OS won't kill a process unless the user insists, or a resource disaster is imminent. They can deal with a pause, provided the processes external view of the state of the CPU + memory are not drastically changed.
Windows finally had suspend working reliably, where memory was frozen, and nothing else on the PC could change the state of memory or the CPU. Modern standby is Intel/Microsoft's effort to hoist that mobile-style of operating system management onto PC's, in an environment that was not expecting it.
They should have slowly rolled it out, with thermal protections from the get go to prevent disaster, and after a generation or two when the hardware + software are working correctly, made it on by default. It seems like they rushed it for Win 10, and then made it the default on Win 11 before it was really stable.
Their Modern Standby requirements should have included a clause saying that the machines efficiency core (which I assume is what would be running in standby) should not be able to raise the temperature enough to require a fan.