This is an accurate description of the problem. In theory a patent for "A flying device by propulsion of engine and rotary propeller" is a fine patent, but the

This is an accurate description of the problem. In theory a patent for "A flying device by propulsion of engine and rotary propeller" is a fine patent, but the details of the patent would have to go into implementation. Patents, in theory, apply to methods rather than concepts, so if someone does patent "a one click shopping button" they should only hold patent for their implementation. The problem is both the misapplication of patents which appear to grant patents over any implementation, as well as patents over implementations which are too simple, such that anyone who wants to build a similar item would go to that implementation as an obvious solution.