[xkeysc0re]

Not if you still have older CRT monitors or plasma screens.

Also login / lock screens are essentially just screen savers

[axiolite]

Screen blanking and DPMS power-off accomplish the same goals, with considerably less energy usage.

[floatingatoll]

Didn’t it used to be necessary to exercise the pixels to keep them from burning in, rather than just turning off the screen? Or is that a thing that started with plasma TVs.