That's not right. Most monitors use 8 bits per color / 24 bits per pixel, though some are still using 6 bpc / 18bpp.
HDR doesn't mean or really require more than 8bpc, it's more complicated than that. To skip all the complicated details, it means more brightness, more contrast and better colors, and it makes a big difference for OLED displays especially.
Some day it will make it's way to banking apps/sites being unusable on OSes other than approved "secure" ones.
That day was years ago. Many banking apps refuse to start if you even just have your bootloader unlocked, and some banking websites only support Chrome, some really crappy ones even only Chrome or Edge on Windows specifically.
KDE did bother, this does neither happen with KScreenlocker, nor do non-screenlocker windows show in another way, because the screen locker is integrated with the compositor.
If the compositor crashes or gets disabled somehow ofc though, that integration doesn't help either and you have to rely on a mountain of bad hacks as well as the hope that the screen locker doesn't also crash for nothing to happen in that case, but it's as close to secure screen locking as you get on Xorg... in the end the solution for secure screen locking is still Wayland.
S3 is standby. Hibernate is S4
You'll need to specify what DE you're using. This comes built in with KDE Plasma: Meta+left and then quickly also up for top left corner, Meta+right and then quickly also down for bottom right corner etc.
I don't knowt what exact shortcuts other DEs use, but I think most that aren't Gnome support quarter tiling too
I'd recommend you to make backups either way. I've had a SSD with SMART status "good" very suddenly die before, so don't take any chances!
All it ever was intended for was to make us feel like something was being done while doing absolutely nothing.
It certainly does help a little bit. But it's of course still not a coincidence that companies are pushing for it instead of more effective measures... It's not just cheap but it also pushes people to believe that measures to save the environment are all useless and annoying, and makes them less likely to want more to happen.
The very next words are "but it was my responsibility"... what exactly is bad about that statement if you don't intentionally cherry pick a bad quote?
Why would they do that? They're intentionally not supporting OpenGL, so that people use their proprietary API
Telemetry wasn't a factor iirc. The biggest reasons for this change were that
... or targeting Microsoft again too
Sounds like you want color management, not just arbitrary saturation changes.
Install KDE Plasma, select the "built-in" color profile, and you're done, no more oversaturated colors. If you want to test how it looks, just use a live boot.