From my own experience, Linkedin is currently the best place to get your profile discovered by a potential employer. There are others too like triplebyte, workatastartup, etc. but linkedin is the biggest.
If you are seeking a job then you are better off contacting and reaching out yourself. But even in this case having a linkedin profile, lots of connections and references help potential employers screen you later in the process.
I think the problem is not discovery but the problem is that only garbage comes from LinkedIn. I've never gotten a job that was worthwhile from LinkedIn.
If you are seeking a job then you are better off contacting and reaching out yourself. But even in this case having a linkedin profile, lots of connections and references help potential employers screen you later in the process.