"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.

My 3D printer has a physical off switch. And it runs Linux - debian - on an embedded ARM board, so I can ssh into the printer etc. (I can even hook up a keyboard and HDMI monitor)

I fear about my filesystem every time I notice the printer is running at night (after a long print job) and I just turn it off without going over to my pc, ssh in and shut down the OS.

Still, it hasn't eaten my filesystem, yet ... ext4 journaling DOES seem to work.