The LSI's are Polks Top of the line speakers. ie high end, better sound & performance over their other lines.
Your idea of high end ie B & W is attributed to what? their price? Who cares. I have never heard any of their speakers that I would like to own, simply because their metal tweeters give me a headache after about an hour.
Who sets these performance standards? What is the criteria based on?
All of this is subjective. People like what they like. I base my likes upon what is pleasing to 1. my ears, 2. my eyes, 3. my wallet. So long as the speakers meet MY performance standards that is all that matters.
I don't give a rats *** about what any magazine has to say about Polk, or any audio snob who scoffs because of the price of the speakers.
My ears like what they hear from Polks, They have been in business for over 30 years and have a great reputation for value & performance, and outstanding customer service.
For me, that is all that is important.