Because in practice they are ultra-temporary.
Various kinds of BitLocker, mostly.
Because our A/B testing showed that showing them was worse.
Two things with the same name, how confusing.
Hey, look at that desktop over there.
Top to bottom.
Put the option in the shortcut target.
Look for the explorer browser helpers.
Because pressing Volume-Up 100 times would be really annoying.
And your little console too.