One is calculated. The other is self-promotion.
Clipboard history operates asynchronously, so you are changing it before it can respond to the changes.
Looking for the magic button.
It's not you, it's me.
It prevents access to the tools, but not to the registry itself.
Code pages and custom keyboard handling.
Most places will do it for you, or at least try.
regsvr32?
You can't force something that isn't there.
A bit of a typing saver, particularly with complex machine names.
Balancing convenience against security, and how you can tune the knobs toward more security.