My belief:
The more secure you try to make systems and software makes them either less secure or become unused and useless.
Some examples locking down Windows that a regular user has problems even changing the the background image on the desktop. They will then find every possible way to bypass that rule, or if it is a privately owned system they will turn off all security.
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Jim P.
A little bit of this and a little byte of that can cause bloatware.