Most investors aren't interested in Satoshi's posts or bitcoin's whitepaper. If ppl read Satoshi's work it's going to assist learning but they're using crypto to make money they don't care about any thing else. Making sig posts & small trades keeps most ppl here.
You are right even I can sure that most of the people involved in BTC or even BTC mining have not read the BTC whitepaper completely yet, they know some of the words by reading some posts on social media, but I can bet most of them have not dedicated their time to learn it because it will not bring them any money.
You make good point that making sig posts is the main thing or one of the main factors which is keeping these people engaged here and that can be wrong too to say because some people really give importance to all these postings because it have become their hobby even in start it was not, so in their free times they don't scroll they spend their time here reading and exploring.