I wanted to come say the same thing. It feels like the only people peddling the social proof section are theme designers and website services.

Who reads that section? How often is it real vs stock images.

A somewhat exception I noticed on Spindrift (I guess I do read them sometimes..) https://drinkspindrift.com/products/lemon-sparkling-water

I would personally keep everything mentioned but leave out the social proof (I do B2C). Instead I prefer to add more screenshots or possibly small videos

What does this mean?

Hero is a big imagine banner across the page with a quick slogan.

Social proof are the testimonies where companies or people are listed with quips like "X was the best solution I've ever used."

The combination is very popular for landing pages and GP is tiring of them, like people tired of generic Bootstrap sites: http://www.dagusa.com/

That site is hilarious!