We've had a have a few issues related to the move to modern sleep - in that "shutdown" is now hibernate (with fast boot enabled) - so any issues that would be fixed with a restart remain.

With some machines, the modern sleep where it stays connected to the network can sometimes cause connection issues that aren't as obvious to the end user.

In a lot of cases we disable fast boot, and disable modern sleep and the problem goes away - but having the ability to select which parts should be enabled and disabled, like how you get the option with PS5's rest mode, would be very useful - especially if controllable by GPO / Intune.