You are looking through the eyes of an individual contributor, but it is not a social network for individuals and job search is a side effect. The main audience is marketing and sales services and executives, to advertise and network in their niche. The generic posts are equivalent to billboard ads, made by people literally paid to spend their day doing marketing (and so post generic things on LinkedIn). What might be confusing is there is also a huge wannabe/aspirational individual entrepreneurs and marketers crowd that are LARPing being successful on it, and as an individual you might only see this surface.