Completely agree, the confusing bit then is the call to action, instead of "Help me educate LinkedIn" its "I'm deleting my account."

Does the author want to fix LinkedIn? Do they want a different service (or the same service done differently?) or a nearly the same service? It is easy to be dismissive of this form of rant, and sometimes that is actually the best response. But if there is something to learn here[1] that would be good too.

I suspect I'm overthinking it and the author was just venting.

[1] I get the 'here is another exemplar of stupid design' thought as well.