There's really no question that maintaining radio and radar contact with ATC significantly adds to flight safety, whether you're IFR or VFR, and whether you're going somewhere or just boring holes. But it's vitally important to remember that when your communications are lost, airplanes fly on physics discovered by Bernouli, not on communications pioneered by Marconi. Losing communications or radar contact will not cause your plane to spiral down and leave a smoking hole in the ground. In my home state of Idaho, mountain ranges often block line-of-sight radio signals and radar returns, so I've grown familiar with how to cope safely.
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