One of the problems is that it isn't even good communication to say (for example) "This device has a 7 inch screen." That's mostly useless information for most people.
It's much more genuinely helpful to tell people something like "You can easily read our large screen even in bright sunlight." Most people aren't going to see specs concerning screen size and mentally translate that to "Woah, this will make my life easier because it will be more readable than the dinky thing I currently use."
Good product descriptions explain to you what this thing will do for you. If it gives a spec, such as weight, it needs to also tell you why this matters -- such as "this is lightweight for this type product, making it much more portable than average so you can take it with you to the work site."
There is no clear dividing line between the kind of description that explains you can do X with this product and the kind of advertising that leaps to implying "And then women will fall madly in love with you and you will be the new Don Juan of your neighborhood!"
Over the years, I've wondered a great deal where the dividing line is between good communication and active manipulation. I think that line is actually quite fuzzy.
When push comes to shove, if you want to tell people about X, you can be assumed to have an agenda of some sort. But, most days, I'm reluctant to suggest the world would be a better place if we all just stopped communicating entirely.