After speaking to a lot of friends about this, this really depends on whether you put value on design work. As an engineer, it's easy to dismiss stuff like the design work without realizing how much time and money is spent prototyping and refining this stuff.
There's not a lot of debate about how Samsung build consumer products - shamelessly copy the guys who sell more than they do, and combine that with really solid engineering. It's sort of the best of both worlds for the consumer, until of course the guys who were doing the design work go out of business (ie Motorola) and we're stuck with really uninspired design again.
Point being, it's reasonable to protect released products, but if we protect everything in the concept stage that's never released, then it would be ridiculously easy to iterate on all possible shapes for a cellphone and lock it down as a potential design, which would then prevent everyone else from creating a cellphone that had a shape.
Haul that into court and say "Oh, yeah. We designed a phone that was trapezoidal on Feb. 3, 2015. Never released it, but those other guys are definitely copying our design."
It's submarine patents all over again.