What LinkedIn does well
It confirms identity, company, and network graph. It is a useful destination after the first interaction.
What it does not do well
It does not organize event-specific follow-up, urgency, or note review in a focused way. It was not designed for dense conference capture.
Why an event manager is different
A dedicated event contact manager stores people together with notes, event context, and follow-up timing. That gives you a much stronger post-event workflow.