Subscribers are a standing invitation. Followers see you when the feed decides. Subscribers get notified. For a founder with a modest following, a newsletter is usually the highest read-rate thing they publish.
Long-form filters for buyers. Most people won’t read 1,400 words from a stranger. The ones who do are either genuinely in your market or about to be. A newsletter has a lower audience and a much better one.
It is the proof a sceptical buyer wants. Short posts show you have opinions. A run of twelve issues shows you’ve thought about the problem for a year. That’s what gets forwarded internally before a procurement conversation.
Issues get found later. Newsletter issues sit on your profile and stay reachable long after a post has disappeared from the feed, which makes them the thing people send each other months afterwards.
And one honest limitation. The subscriber relationship belongs to LinkedIn, not to you. You can’t export it, and if your account went away tomorrow so would the list. We tell every client this on the first call, and we usually recommend running an owned email list alongside it rather than instead of it.