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Not always.

If earth ground is for safety only then I would like to note the following.
If we look at your typical AC line input filter schematic from Corcom. we note a small cap going to earth ground.
If we look at how a screen room is constructed we note that the entire metal housing of the screen is earth grounded.
If we look at some of the chassis's that are used in some instrumentation we note that the chassis has a fine mesh metal screen over the fan, and in addition the chassis will also contain adhesive copper fingers that are placed along the internal sides to reduce the discontinuities of the chassis.
In balanced connections pin 1 of the XLR connector on much of pro equipment is connected to earth and is typically called "shield".

I also note that in talking with a computer technician that he can't use his cell phone and work on an open computer, he has to close it up. It would appear that the earth grounded case of the computer is acting as a shield for the HF frequencies in the above example.

It would appear from the above that certainly a fairly large part of the electronics industry uses earth ground as a shield.
d.b.

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