The value of having a LinkedIn presence obviously depends on your role / industry, lots of other ways to get notoriety in tech, but among all the fakeness I’ve found a lot of people who genuinely want to help students / young people succeed. Having a large network just increases the likelihood that when you do want to use it for something (advertising, networking, job seeking) that your efforts are more effective.
Check my other comment, but I have 1500+ connections, and it has directly correlated to more recruiters reaching out to me and more offers than my peers. I know people who have gotten jobs either from visibility from or the direct skill of making content (see Alexis bertholf on LinkedIn, making network eng cool again). It’s simply the best optimized way to connect with valuable businesspeople right now. And this is only one way to look at it.
Pretty minimal engagement gets you a lot on the other side of it. I’m not saying you need to post more than once a quarter, but the reality is that it’s so easy to do yourself and there’s so many people desperate for jobs right now that it’s an pretty simple way to up your chances. There’s tons of free tools for auditing / optimizing your LinkedIn, and posting / reposting takes maybe an hr a week.