@stop4stuff - It's a mix.
Truncating works, research shows that customers don't want to read long text, scroll, hunt, click or do anything at all. The research/statistics into customer behavior is actually terrifying.
On the other hand the more content you have, the better your seo results so it makes sense to shorten content into manageable segments.
BUT - it's usually over used for ad placement. Everyone (including the big box retailers) want their ads at that prime time eyeline so it's a race to cram and condense as much info into above the fold as possible.
It's also a trend. I remember when there was a great call for scripts to summarize blog content, rss feeds, and all the social networking media that followed. Add to that the minimalist trends of Apple and other giants and you get the current climate.
So yes I recommend it to my clients for e-commerce functionality and they request it so they can look like the big guys.
, For my ecommerce clients I usually write a script so the client easily controls what information shows in the short description rather than truncating at an arbitrary character or pixel limit. I may set and outlier character amount to preserve other template features but I like my clients to have the control. Different products may require additional info like sizes, colors, styles etc.
So I'm all for shortening the info, but just not the way it's currently being employed by SW.
Sheesh, I can't spell today, sorry!