Final answer:
While not always 'almost impossible', it is generally true that complex products often require a well-planned demonstration for clients to fully understand them. Demonstrations help illustrate product functionality and benefits, aiding customer comprehension.
Step-by-step explanation:
It can often be challenging for clients to fully grasp the complexities and functionalities of certain products without a well-planned demonstration. While the statement may not universally hold true as an absolute, generally speaking, intricate products such as sophisticated electronics, software, or machinery can be quite difficult to understand without a demonstrative aid. Demonstrations serve as an essential tool for providing practical examples of how the product works and its benefits, thereby enhancing the customer's understanding and potentially influencing their purchasing decision.