"It is now safe to turn off your computer" was a kludge for running Windows 95 on PCs with a physical on/off switch (as opposed to newer ATX power supplies, which have a pushbutton to turn them on and can be switched off via software). I guess it's theoretically possible to build a modern PC with a 30+ year PSU, and then you would see this screen again - or, more realistically, you could disconnect the PS_ON line (https://electronics.stackexchange.com/questions/394414/how-d...) from the mainboard, preventing the system from turning off the PSU.